Answer:
b(b/a)^2
Step-by-step explanation:
Given that the value of the car depreciates such that its value at the end of each year is p % less than its value at the end of the previous year and that car was worth a dollars on December 31, 2010 and was worth b dollars on December 31, 2011, then
b = a - (p% × a) = a(1-p%)
b/a = 1 - p%
p% = 1 - b/a = (a-b)/a
Let the worth of the car on December 31, 2012 be c
then
c = b - (b × p%) = b(1-p%)
Let the worth of the car on December 31, 2013 be d
then
d = c - (c × p%)
d = c(1-p%)
d = b(1-p%)(1-p%)
d = b(1-p%)^2
d = b(1- (a-b)/a)^2
d = b((a-a+b)/a)^2
d = b(b/a)^2 = b^3/a^2
The car's worth on December 31, 2013 = b(b/a)^2 = b^3/a^2
Two rainstorms occurred in one week. First storm 15 mL of rain fell per hour. Second storm 30 mL of rain fell per hour. The rain lasted for a total of 70 hours with a total of 1500 mL. What was the duration of each storm?
Answer:
The answer to your question is the first rain lasted 40 hours and the second rain lasted 30 hours.
Step-by-step explanation:
Data
1st 15 ml/h = x
2nd 30 ml/h = y
Total time = 70 h and 1500 ml
1.- Write 2 equations
First rain + second rain = 70 h
x + y = 70 (I)
15x + 30 y = 1500 (II)
2.- Solve equations by elimination
Multiply first equation by -15
-15x - 15y = - 1050
15x + 30y = 1500
0x + 15y = 450
y = 450 / 15
y = 30 h
x + 30 = 70
x = 70 - 30
x = 40 h
3.- Conclude
The first rain lasted 40 h and the second rain lasted 30 h.
Final answer:
The first rainstorm lasted for 40 hours and the second rainstorm lasted for 30 hours. A system of equations method was used to find the duration of each storm.
Explanation:
Calculating Duration of Rainstorms
Let's denote the duration of the first storm as x hours and the second storm as y hours. The total amount of rain for the first storm would then be 15 mL/hour × x hours and for the second storm 30 mL/hour × y hours. Given that the total duration of the rain is 70 hours, we can set up the following equation: x + y = 70. Additionally, since the total volume of rain is 1500 mL, we have 15x + 30y = 1500.
We can solve this system of equations by multiplying the first equation by 15 to eliminate variable y: 15x + 15y = 1050 and then subtracting this from the second equation: (15x + 30y) - (15x + 15y) = 1500 - 1050, which simplifies to 15y = 450. Thus, y = 30 hours. Finally, we substitute y into x + y = 70 to find x: x = 70 - 30, so x = 40 hours.
Hence, the first storm lasted for 40 hours and the second storm lasted for 30 hours.
A recipe Uses 1 1/4 cups of milk to make 10 servings if the same amount of milk is used for each serving how many servings can be made using one gallon of milk
Answer:
128
Step-by-step explanation:
There are a couple of ways to go at this. One is to use a proportion:
(10 servings)/(1.25 cups) = (x servings)/(16 cups)
160/1.25 = x = 128 . . . . . . . multiply by 16 and simplify
1 gallon of milk will make 128 servings.
__
Another way to go at this is to figure out how much milk is used in one serving. It is ...
1.25 cups/(10 servings) = 0.125 cups/serving = 1/8 cup/serving
Now, you can work with several different conversion factors:
1 cup = 8 oz
1 gal = 128 oz
1 gal = 16 cups
Obviously 1/8 cup is 1 oz. Since there are 128 oz in a gallon, the gallon will make 128 servings.
__
Or, you can divide 16 cups by (1/8 cup/serving) to find the number of servings:
(16 cups/gal)/(1/8 cup/serving) = 16·8 servings/gal = 128 servings/gal
Answer:
128
Step-by-step explanation:
I can do math yay
The sum of the ages of Berma, her mother Rinna and her father Erwin is 80. Two years from now, Rinna’s age will be 13 less than the sum of Erwin’s age and twice Berma’s age. Three years ago, 15 times Berma’s age was 5 less than the age of Rinna. How old are they now?
Answer: Berma is 5 years old
Rinna is 38 years old
Erwin is 37 years old
Step-by-step explanation:
Let x represent Berma's age
Let y represent Rinna's age
Let z represent Erwin's age
Since the sum of their ages is 80,
x + y + z = 80 - - - - - - -1
Two years from now, Rinna’s age will be 13 less than the sum of Erwin’s age and twice Berma’s age. This means that
y +2 = [ (z+2) + 2(x+2) ] - 13
y +2 = z + 2 + 2x + 4 - 13
2x - y + z = 13 + 2 - 4 -2
2x - y + z = 9 - - - - - - -2
Three years ago, 15 times Berma’s age was 5 less than the age of Rinna. It means that
15(x - 3) = (y - 3) - 5
15x - 45 = y - 3 - 5
15x - y = - 8 + 45
15x - y = 37 - - - - - - - -3
From equation 3, y = 15x - 37
Substituting y = 15x - 37 into equation 1 and equation 2, it becomes
x + 15x - 37 + z = 80
16x + z = 80 + 37 = 117 - - - - - - 4
2x - 15x + 37 + z = 9
-13x + 2 = -28 - - - - - - - - -5
subtracting equation 5 from equation 4,
29x = 145
x = 145/29 = 5
y = 15x - 37
y = 15×5 -37
y = 38
Substituting x= 5 and y = 38 into equation 1, it becomes
5 + 38 + z = 80
z = 80 - 43
z = 37
A rectangular deck is to be constructed using a rock wall as one side and fencing for the other three sides. There are 24 yards of fencing available. Determine the dimensions that would create the deck of maximum area. What is the maximum area? Enter only the maximum area. Do not include units in your answer.
The problem is solved by using calculus to find the maximum of the area function for a rectangle. The dimensions that yield maximum area with 24 yards of fencing are a length of 6 yards and a width of 12 yards, resulting in an area of 72 square yards.
Explanation:The problem involves maximizing the area of a rectangle with a fixed perimeter. Let's define the length of the rectangle as x and the width as y. Since you have 24 yards of fencing and you need to enclose three sides of the rectangle, the perimeter equation becomes 2x + y = 24, which can be rearranged as y = 24 - 2x.
The area of the rectangle can be represented by the equation A = xy, and substituting the y value from our perimeter equation, we get A = x(24 - 2x). To maximize this area, we take the derivative of A with respect to x and set it equal to zero, yielding the equation 24 - 4x = 0, or x = 6. Substituting x = 6 back into the y equation gives y = 12.
Therefore, the dimensions that maximize the area of the deck are a length of 6 yards and a width of 12 yards. Substituting these values back into the area equation gives a maximum area of 72 square yards.
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Candace's backyard has a flower garden that covers 40% of her backyard.If the total area of her backyard is 450 square feet, how many square feet is her flower garden? A40 B180 C270 D18,000
Answer: option B is the correct answer
Step-by-step explanation:
Candace's backyard has a flower garden that covers 40% of her backyard.
If the total area of her backyard is 450 square feet, it means that her garden covers 40% of 450 square feet.
To determine how many square feet is her flower garden, we will find the value of 40% of 450 square feet. It becomes
40/100 × 450= 0.4×460 = 180 square feet
In a swim-and-run biathlon, An Athlete must get to a point on the other side of a 50 meter wide river, 100 meters downstream from her starting point. Ann can swim 2 m/sec and run 5 m/sec. What path should Ann take in order to minimize her total time?
Answer:
running distance = 78,18 m
swimmingdistance = 92m
Step-by-step explanation:
Ann has to run a distance 100 - x and swim √ (50)² + x²
at speed of 5 m/sec and 2 m/sec
As distance = v*t t = d/v
Then running she will spend time doing d = ( 100-x)/5
and √[(50)² + x² ] / 2 swimming
Therefore total time of biathlon
t(x) = ( 100 - x )/5 + √[(50)² + x² ] / 2
Taking derivatives both sides of the equation we get
t´(x) = - 1/5 + [1/2 ( 2x)*2] / 4√[(50)² + x²]
t´(x) = - 1/5 + 2x / 4√[(50)² + x²] t´(x) = - 1/5 + x/2√(50)² + x²
t´(x) = 0 - 1/5 + x/2√(50)² + x² = 0
- 2√[(50)²+ x²] + 5x = 0
- 2√(50)²+ x² ) = -5x
√(50)²+ x² = 5/2 *x
squared
(50)² + x² = 25/4 x²
2500 - 21/4 x² = 0
x² = 2500*4/21
x = 21,8 m
Therefore she has to run 100 - 21,82 = 78,18 m
And swim √(50)² + (78,18)² = 92m
The question pertains to Physics and involves calculating the optimal path in a swim-and-run biathlon to minimize total time, which would typically involve physics and calculus. However, the scenario is incomplete and lacks necessary information for a precise solution.
Explanation:The subject of this question is Physics, as it involves concepts of speed, velocity, and optimization of travel paths in a biathlon, which includes both swimming and running. To answer the question on the optimal path Ann should take in the swim-and-run biathlon, we would use principles of physics and calculus to find the path that minimizes the total time. The calculation would involve deriving the functional relationship between swimming and running speeds, and the distances covered in each stage, then determining the point at which Ann should exit the water to reach the end point in the shortest total time. However, since the problem in the question is incomplete and requires additional information, such as the current of the river or whether Ann swims at a constant speed relative to the water, we cannot solve it without making assumptions that may be incorrect.
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How many terms are in this equation?
Answer:
2
Step-by-step explanation:
Terms are products separated by +'s and −'s. Here, there are 2 terms:
2 tan(1/t) / (1/t)
sec²(1/t)
This Venn diagram shows the pizza topping preferences for 9 students. Let event A = The student likes pepperoni. Let event B = The student likes olives. What is P(A or B)?
Answer:
[tex]P(A\ or\ B)=\frac{7}{9}[/tex]
Step-by-step explanation:
We need to use the formula to calculate the probability of (A or B) where
A=Probability a student likes pepperoni
B=Probability a student likes olive
A and B =Probability a student likes both toppings in a pizza
A or B =Probability a student likes pepperoni or olive (and maybe both), a non-exclusive or
The formula is
[tex]P(A\ or\ B)=P(A)+P(B)-P(A\ and\ B)[/tex]
Since 6 students like pepperoni out of 9:
[tex]P(A) = \frac{6}{9}[/tex]
Since 4 students like olive out of 9:
[tex]P(B) = \frac{4}{9}[/tex]
Since 3 students like both toppings out of 9
[tex]P(A\ and\ B) = \frac{3}{9}[/tex]
Then we have
[tex]P(A\ or\ B)=\frac{6}{9}+\frac{4}{9}-\frac{3}{9}[/tex]
[tex]P(A\ or\ B)=\frac{7}{9}[/tex]
In survey conducted by Quinnipiac University from October 25-31, 2011, 47% of a sample of 2,294 registered voters approved of the job Barack Obama was doing as president.
What is the 99% confidence interval for the proportion of all registered voters who approved of the job Barack Obama was doing as president?
A) (0.460, 0.480)
B) (0.453, 0.487)
C) (0.450, 0.490)
D) (0.443, 0.497)
Answer:
D) (0.443, 0.497)
Step-by-step explanation:
Previous concepts
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The confidence interval for a proportion is given by this formula
[tex]\hat p \pm z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}[/tex]
For the 99% confidence interval the value of [tex]\alpha=1-0.99=0.01[/tex] and [tex]\alpha/2=0.005[/tex], with that value we can find the quantile required for the interval in the normal standard distribution.
[tex]z_{\alpha/2}=2.58[/tex]
And replacing into the confidence interval formula we got:
[tex]0.47 - 2.58 \sqrt{\frac{0.47(1-0.47)}{2294}}=0.443[/tex]
[tex]0.47 + 2.58 \sqrt{\frac{0.47(1-0.47)}{2294}}=0.497[/tex]
And the 99% confidence interval would be given (0.443;0.497).
We are confident that about 44.3% to 49.7% of registered voters approved of the job Barack Obama was doing as president.
A farmer is using a barn as one side of a fence to enclose his cattle. If the barn is 80 feet long what is the width of the rectangular enclosure if the farmer has 260 ft. Of fencing to complete the project?
Answer:
90 feet
Step-by-step explanation:
The perimeter is the sum of the side lengths of the enclosure. The length is given as 80 ft, but only one side that long counts as part of the 260 ft of fence. So, we have ...
260 ft = 2×W + L = 2×W + 80 ft . . . . . length of fence for 3 sides
180 ft = 2×W . . . . . . subtract 80
90 ft = W . . . . . . . . . divide by 2
The width of the enclosure is 90 feet.
Final answer:
To find the width of the farmer's rectangular enclosure, we subtract the length of the barn (80 ft) from the total amount of fencing available (260 ft) to get the length available for the other three sides. Dividing this by two (because there are two widths), we find that the width of the enclosure will be 90 feet.
Explanation:
The question asks about creating a rectangular enclosure using a fixed length of fencing and a barn as one of the sides. With 260 feet of fencing available and the barn covering one side of 80 feet, the farmer must use the remaining fencing for the other three sides of the rectangle.
To find the width of the rectangular enclosure, we need to subtract the length of the barn side from the total amount of fencing available, and then divide by two (because there are two widths in a rectangle), as follows:
260 ft - 80 ft = 180 ft for both widths, so each width will be
180 ft / 2 = 90 ft.
Therefore, the width of the rectangular enclosure will be 90 feet.
Help please??.... I don’t understand
Answer:
0.50 m²9.8 in²Step-by-step explanation:
Whole Circle
The formula for the area of a circle is ...
A = πr² . . . . . where r is the radius and π is the value given
The radius of the circle is half the diameter, so is 0.4 m. Putting the numbers into the formula, we get ...
A = (314)(0.4 m)² = 0.5024 m²
Rounding to the nearest tenth, the area is ...
0.5 m²
__
Area of Sector CTM
As above, the area of the circle is ...
A = πr² = (3.14)(3 in)² = 28.26 in²
A whole circle has a central angle of 360°. The sector of interest has a central angle of 125°, so its area is the fraction 125/360 of the area of the whole circle.
sector area = (125/360)(28.26 in²) = 9.8125 in²
Rounding to the nearest tenth, the sector area is ...
9.8 in²
A jar contains 800 red and green jelly beans. Of those, 320 are red and the rest are green. What is the ratio of red and green jelly beans?
Answer:
The ratio is 2 to 3.
Step-by-step explanation:
The jar is comprised of only red and green jelly beans. We are given the number of total beans and the number of red beans. We calculate the number of green beans by doing 800-320 = 480.
The problem is asking for the ratio of red to green jelly beans, which is 320 to 480, or 320/480. Simplified, this is 2/3.
The ratio of red to green jellybeans will be 1/3.
What are ratios and proportion?Ratio is a quantitative relation between two amounts showing the number of times one value contains or is contained within the other. A statement expressing the equality of two ratios A:B and C:D is called a proportion. We can express proportion as -
A : B ∷ C : D
AND
A x D = B x C
Product of extremes equal to product of means
We have a jar that contains 800 red and green jelly beans. Of those, 320 are red and the rest are green.
Number of red beans = 320
Number of green jelly beans = 800 - 320 = 480
Ratio of red to green jellybeans = 320/480 = 1/3
Therefore, the ratio of red to green jellybeans will be 1/3.
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Which statements are true about the ordered pair (−4, 0) and the system of equations?
{2x+y=−8
x−y=−4
Select each correct answer.
The ordered pair (−4, 0) is a solution to the first equation because it makes the first equation true.
The ordered pair (−4, 0) is a solution to the second equation because it makes the second equation true.
The ordered pair (−4, 0) is not a solution to the system because it makes at least one of the equations false.
The ordered pair (−4, 0) is a solution to the system because it makes both equations true.
Answer:
first, second, and fourth are correct
Step-by-step explanation:
2(-4) + 0 = -8; this is correct because -8 + 0 = -8
(-4) - 0 = -4; this is correct because -4 - 0 = -4
We know that they are both true, so the fourth choice is true as well.
Statements first, second, and fourth are true about the ordered pair (−4, 0) and the system of equations, 2x+y=−8 and x−y=−4.
What is the equation?An equation is a statement that two expressions, which include variables and/or numbers, are equal. In essence, equations are questions, and efforts to systematically find solutions to these questions have been the driving forces behind the creation of mathematics.
It is given that,
2x+y=−8
x−y=−4
The correct statements for the ordered pair (−4, 0) are,
Because it makes the first equation true, the ordered pair (4, 0) is a solution to the first equation.
⇒2(-4) + 0 = -8
⇒-8 + 0 = -8
Because it makes the second equation true, the ordered pair (4, 0) is a solution to the second equation.
⇒(-4) - 0 = -4
⇒-4 - 0 = -4
The ordered pair (4, 0) makes both equations true, making it a solution to the problem.
Thus, statements first, second, and fourth are true about the ordered pair (−4, 0) and the system of equations, 2x+y=−8 and x−y=−4.
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Owen earns a base salary plus a commission that is a percent of his total sales. His total weekly pay is described by f(x)=0.15x+325, where x is his total sales in dollars. What is the change in Owen's salary plan if his total weekly pay function changes to g(x)=0.20+325?
Answer:
0.05x
This is equivalent to 5% of the total amount of sales.
Step-by-step explanation:
Previous Weekly pay function for Owen; f (x) = 0.15x +325-------------------- (1)
Current Weekly pay function for Owen; g(x) = 0.20x +325--------------------(2)
Change in Owen's Salary plan is equation (2) minus equation (1)
g(x) - f(x) = (0.20x+325)-(0.15x+325)
= 0.05x
The new change in Owen's salary is 5% of the total amount of sales
At the beginning of the year, a sporting goods store had $250,000 worth of inventory. The store’s buyers purchased an additional $115,000 worth of inventory during the year. At year’s end, the value of the inventory was $185,000. What was the store’s cost of goods sold?
Answer:
180000
Step-by-step explanation:
please help me solve the screenshot below.
Answer:
The arrangement of the given equation in the slope - intercept form are
[tex]y=-x+4[/tex][tex]y=2x-5[/tex]Step-by-step explanation:
Given:
x + y = 4 and
y - 2x = -5
Slope - intercept form :
[tex]y=mx+c[/tex]
Where,
m is the slope of the line.
c is the y-intercept.
When two points are given say ( x1 , y1 ) and ( x2 , y2) we can remove slope by
Slope,
[tex]m=\frac{y_{2}- y_{1}}{x_{2}- x_{1}}[/tex]
Intercepts: Where the line cut X axis called X- intercept and where cut Y axis is called Y- intercept.
So, the Slope -intercept form of
x + y = 4 is [tex]y=-x+4[/tex]
and
y - 2x = -5 is [tex]y=2x-5[/tex]
Solve the equation by factoring. 2x2 = 28 - x
x = -3.5 or x = 4
x = 2 or x = -7
x = -2 or x = 7
x= -4 or x = 3.5
Answer:
2x^2 = 28 - x
-28+x -28+x
2x^2 + x - 28 = 0
ac=-56
m+p=-7,8
(2x-7)(2x+8)=0
2x-7+7=0+7
2x/2=7/2
x=3.5
2x+8-8=0-8
2x/2=-8/2
x= -4
Step-by-step explanation:
subtract from right to left to get the equation in a standard form = 0since there's no GCF and no two numbers that multiply to -28 and add to x, we can multiply a and c (-56), then find two numbers that multiply to ac and add to bx (-7,8). factor the equation into two binomials and set them equal to zero. the binomials must start with the square root of the first term and end with the square root of the second term.solve for x if the two binomials.x=-4 or 3.5
Final answer:
The quadratic equation 2x² = 28 - x is solved by rearranging it to 2x² + x - 28 = 0, factoring by grouping, and finding the solutions x = 4 and x = -3.5. The solutions are verified by substituting them back into the original equation.
Explanation:
To solve the equation by factoring, we first need to rearrange the equation to set it to zero. The original equation given is 2x² = 28 - x. Moving all terms to one side gives us 2x² + x - 28 = 0. We can solve this quadratic equation by factoring:
First, look for two numbers that multiply to give ac (in this case, 2 * -28 = -56) and add to give b (in this case, 1).
These two numbers are 7 and -8 since 7 * -8 = -56 and 7 + (-8) = -1.
Rewrite the middle term using these two numbers: 2x² + 7x - 8x - 28 = 0.
Factor by grouping: (2x² + 7x) - (8x + 28) = 0.
Factor out the common terms: x(2x + 7) - 4(2x + 7) = 0.
Factor out the common binomial: (x - 4)(2x + 7) = 0.
Solving each factor separately gives us: x = 4 and x = -7/2 or -3.5.
The solutions we find are x = 4 and x = -3.5. To check if these solutions are correct, we can substitute them back into the original equation and verify if they satisfy the equation, thereby confirming they are correct.
A modified roulette wheel has 36 slots. One slot is 0, another is 00, and the others are numbered 1 through 34, respectively. You are placing a bet that the outcome is an odd number. (In roulette, 0 and 00 are neither odd nor even.)
Answer:0.472
Step-by-step explanation:
Given
there are 36 slots with 0 and 00 as two slots which are neither odd nor even
i.e. there are 34 remaining slots numbered 1 to 34
there are 17 odd terms and 17 even terms
thus Probability of getting a odd number is [tex]=\frac{17}{36}=0.472[/tex]
Answer:
P(odd#'s) = number of odd numbers/total number of outcomes = 18/38 = 9/19
Step-by-step explanation:
Is 3/13 closer to 1/2, 1 or 0
Answer: 3/13 is closer to 0 than 1/2 or 1.
- This is because 1/2 of 1/13 would be about 6.5/13.
- Since 3/13 is not close to 1/2, nor it will be to 1.
An inspector inspects large truckloads of potatoes to determine the proportion p in the shipment with major defects prior to using the potatoes to make potato chips. If there is clear evidence that this proportion is less than 0.10, she will accept the shipment. To reach a decision, she will test the hypotheses H0: p = 0.10, Ha: p < 0.10. To do so, she selects a simple random sample of 150 potatoes from the more than 3000 potatoes on the truck. Only eight of the potatoes sampled are found to have major defects. What is the value of the large-sample z test statistic?
Answer: z=1.9065
Step-by-step explanation:
As per given , we have
[tex]H_0: p=0.10\\\\ H_a: p<0.10[/tex]
Sample size : n= 150
No. of potatoes sampled are found to have major defects = 8
The sample proportion of potatoes sampled are found to have major defects :
[tex]\hat{p}=\dfrac{8}{150}=0.0533[/tex]
The test statistic for population proportion is given by :-
[tex]z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}\\\\ [/tex] , where p=population proportion.
n= sample size.
[tex]\hat{p}[/tex] = sample proportion.
[tex]z=\dfrac{0.0533-0.10}{\sqrt{\dfrac{0.10\times0.90}{150}}}\\\\=\dfrac{-0.0467}{0.02449}\\\\=-1.90651951647\approx1.9065[/tex]
Hence, the value of the large-sample z test statistic is z=1.9065 .
In a typical start for his baseball team, Rick throws 120 total pitches with a ratio of 3 fastballs thrown for every 2 curveballs. If Rick makes a relief appearance of 30 pitches using the same ratio, how many fastballs will he throw in the relief appearance?
Answer:
18 fastballs
Step-by-step explanation:
Let x represent each throw
fastball : curve ball = 3:2
For fastball we have 3x while for curve ball we have 2x
If Rick makes a relief appearance of 30 pitches with the same ratio,
3x + 2x = 30
5x = 30
x = 30/5
x = 6
fastball, 3x= 3*6
= 18
curveball = 2x = 2*6
= 12
Rick will throw 18 fast balls
In a game of poker a hand of five cards is dealt to each player from a deck of 52 cards. find the probablility of a hand containing a spade flush.
Answer:
0.00597
Step-by-step explanation:
Given,
Total number of cards = 52,
In which flush cards = 20,
Also, the number of spade flush cards = 5,
Since,
[tex]\text{Probability}=\frac{\text{Favourable outcomes}}{\text{Total outcomes}}[/tex]
Thus, the probability of a hand containing a spade flush, if each player has 5 cards
[tex]=\frac{\text{Ways of selecting a spade flush card}}{\text{Total ways of selecting five cards}}[/tex]
[tex]=\frac{^{20}C_5}{^{52}C_5}[/tex]
[tex]=\frac{\frac{20!}{5!15!}}{\frac{52!}{5!47!}}[/tex]
[tex]=\frac{15504}{2598960}[/tex]
= 0.00597
Kylie explained that (negative 4 x + 9) squared will result in a difference of squares because (negative 4 x + 9) squared = (negative 4 x) squared + (9) squared = 16 x squared + 81. Which statement best describes Kylie’s explanation?
Answer:
C. Kylie did not understand that this is a perfect square trinomial, and she did not determine the product correctly.
just passed on edge-nuity
Step-by-step explanation:
Kylie's explanation is incorrect. The simplified expression for (negative 4x + 9) squared is 16x squared - 72x + 81.
Explanation:Kylie's explanation is incorrect.
The statement that (negative 4x + 9) squared results in a difference of squares is incorrect.
To simplify (negative 4x + 9) squared, we need to multiply the expression by itself. Using the formula (a + b) squared = a squared + 2ab + b squared, we can expand (negative 4x + 9) squared as follows:
(negative 4x + 9) squared = (negative 4x) squared + 2(negative 4x)(9) + (9) squared
= 16x squared - 72x + 81
So, the correct simplification of (negative 4x + 9) squared is 16x squared - 72x + 81, not 16x squared + 81.
There are 24 basketball teams competing in a tournament. After each round half the teams are eliminated. This situation can be modeled by the function
Answer:
b(x)=24(1/2)x
Step-by-step explanation:
The situation can be modeled by the exponential function will be y = 24 (0.5)ˣ.
What is an exponent?Let a be the initial value and x be the power of the exponent function and b be the increasing factor.
The exponent is given as
y = a(b)ˣ
There are 24 ball groups contending in a competition. After each round around 50% of the groups is dispensed with.
Then the value of the b will be 1/2 and the value of the variable 'a' will be 24. Then the exponential equation is given as,
y = 24 (1/2)ˣ
y = 24 (0.5)ˣ
The situation can be modeled by the exponential function will be y = 24 (0.5)ˣ.
More about the exponent link is given below.
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Look at the graph of this system of equations: y = - x2 + 1 and y = x2. At which approximate points are the two equations equal? There more than one answer.
A.(-0.7, 0.5)
B.(0.5, 0.7)
C.(0.7, 0.5)
D.(-0.5, 0.7)
Answer:
option A and C, (-0.7, 0.5) and (0.7, 0.5)
Step-by-step explanation:
The two equations are equal means, the points at which the two graphs meet.
In that case the x and y coordinates satisfy both the graphs.
let the coordinates at the intersection point be (a,b).
Inserting in first equation,
[tex]b = -a^{2} + 1[/tex]
Inserting in second equation,
[tex]b = a^{2}[/tex]
Inserting value of b from second to first equation, we get
[tex]b = -b + 1[/tex]
[tex]b = \frac{1}{2} = 0.5[/tex]
Now inserting the value of b second equation, we get
[tex]\frac{1}{2} = x^{2}[/tex]
[tex]x = \sqrt{\frac{1}{2} } = +\frac{1}{1.414} or -\frac{1}{1.414} = +0.7 or -0.7[/tex]
Thus points are, (-0.7, 0.5) and (0.7, 0.5)
the volume of a cylindrical can is 500cm^3. The materail used to make the top and bottom costs 0.012 cent/cm^2 the material used for the sides costs 0.01 cent?cm^2, and the seam joining the top and bottom to the sides costs .015 cent/cm. what size can would cost the least to produce?
Answer:
radius: 3.671 cmheight: 11.810 cmStep-by-step explanation:
The total cost of producing a cylindrical can with radius r and height h will be ...
cost = (lateral area)×(side cost) +(end area)×(end cost) +(seam length)×(seam cost)
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The lateral area (LA) is ...
LA = 2πrh
Since the volume of the can is fixed, we can write the height in terms of the radius using the volume formula.
V = πr²h
h = V/(πr²)
Then the lateral area is ...
LA = 2πr(V/(πr²)) = 2V/r = 2·500/r = 1000/r
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The end area (EA) is twice the area of a circle of radius r:
EA = 2×(πr²) = 2πr²
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The seam length (SL) is twice the circumference of the end:
SL = 2×(2πr) = 4πr
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So, the total cost in cents of producing the can, in terms of its radius, is ...
cost = (1000/r)(0.01) +(2πr²)(.012) +(4πr)(0.015)
We can find the minimum by setting the derivative to zero.
d(cost)/dr = -10/r² +0.048πr +.06π = 0
Multiplying by r² gives the cubic ...
0.048πr³ +0.06πr² -10 = 0
r³ +1.25r² -(625/(3π)) = 0 . . . . . . divide by .048π
This can be solved graphically, or using a spreadsheet to find the value of r to be about 3.671 cm. The corresponding value of h is ...
h = 500/(π·3.671²) ≈ 11.810 . . . cm
The minimum-cost can will have a radius of about 3.671 cm and a height of about 11.810 cm.
_____
A graphing calculator can find the minimum of the cost function without having to take derivatives and solve a cubic.
Find the values of x and y using trig
Answer:
Step-by-step explanation:
The triangle is a right angle triangle. This is because one of its angles is 90 degrees.
Let us determine x
Taking 47 degrees as the reference angle,
x = adjacent side
11 = hypotenuse
Applying trigonometric ratio,
Cos # = adjacent side / hypotenuse
# = 47 degrees
Cos 47 = x/11
x = 11cos47
x = 11 × 0.6820
x = 7.502
Let us determine y
Taking 47 degrees as the reference angle,
y = opposite side
11 = hypotenuse
Applying trigonometric ratio,
Sin # = opposite side / hypotenuse
# = 47 degrees
Sin 47 = y/11
x = 11Sin47
x = 11 × 0.7314
x = 8.0454
A stretch of highway that is 12 1 4 12 4 1 12, start fraction, 1, divided by, 4, end fraction kilometers long has speed limit signs every 7 8 8 7 start fraction, 7, divided by, 8, end fraction of a kilometer. How many speed limit signs are on this stretch of highway?
Answer:
7
Step-by-step explanation:
Answer:
its 14 signs
Step-by-step explanation:
How would I solve this?
Answer:
It is rotated by 72 degrees.
Step-by-step explanation:
Since it is a regular polygon,when u connect all the corners of it to the middle of the polygon, they will meet at a point i.e, CENTER.
The sum of the angles subtended by all the sided at the center will be 360 degrees.As there are 60 sides, the angle subtended by each side at the center will be 6 degrees.Because,
[tex]\frac{360}{60} = 6[/tex]
As the polygon rotates every minute and it is rotated for 12 minutes,[tex]12*6 = 72[/tex]
( For every minute, it will be rotated by 6 degrees.
so, for 12 minutes it should be rotated by 12 times 6 ( 12*6) = 72 degrees)
So, after 12 minutes it will be rotated by 72 degrees.A hemispherical depression is cut out from one face of a cuboidal wooden block of edge 21cm such that the diameter of the hemisphere is equal to the edge of the cube. Determine the total surface area of the remaining block
Answer:
(2646 +110.25π) cm² ≈ 2992.4 cm²
Step-by-step explanation:
The area of a sphere is 4 times the area of a circle with the same radius. Hence the area of a hemisphere will be 2 times the area of that circle. This means carving a hemispherical depression in the face of the cube will add an area that is equal to the area of the circular hole.
Of course the total surface area of a cube is 6 times the area of one square face. The area of a circle is ...
A = πr² = π(d/2)² = (π/4)d²
The total surface area of the carved cube is ...
S = 6·(21 cm)² + (π/4)·(21 cm)² = (441 cm²)(6 +π/4)
S ≈ 2992.36 cm²
The total surface area of the remaining block is about 2992.4 cm².
Answer:
(2646 +110.25π) cm² ≈ 2992.4 cm²
Step-by-step explanation: