Answer:
v = 7
is the value for which
x = (-21 - √301)/10
is a solution to the quadratic equation
5x² + 21x + v = 0
Step-by-step explanation:
Given that
x = (-21 - √301)/10 .....................(1)
is a root of the quadratic equation
5x² + 21x + v = 0 ........................(2)
We want to find the value of v foe which the equation is true.
Consider the quadratic formula
x = [-b ± √(b² - 4av)]/2a ..................(3)
Comparing (3) with (2), notice that
b = 21
2a = 10
=> a = 10/2 = 5
and
b² - 4av = 301
=> 21² - 4(5)v = 301
-20v = 301 - 441
-20v = -140
v = -140/(-20)
v = 7
That is a = 5, b = 21, and v = 7
The equation is then
5x² + 21x + 7 = 0
Greg sells magazine subscriptions. He earns $.50 for every subscription he sells. He sold 200 magazine subscriptions. How much money did he earn?
Answer:
100 dollars 0.50x200=100
Step-by-step explanation:
Answer:
He made 100 dollars
Step-by-step explanation:
If he makes half a dollar for every one sold, and he sold 200, then you just do 200 times .50 and you get 100
!!!!20 POINTS PLZ HELP!!!
A scale drawing of a rectangular garden has a length of 5 inches and a width of 3.5 inches. If the scale is 1-inch colon 3 feet, what is the area of the actual garden?
Answer options with 5 options
A.10.5 square feet
B.15 square feet
C.17.5 square feet
D.52.5 square feet
E.157.5 square feet
Answer:
E
Step-by-step explanation:
map scale: actual scale
= 1 inch: 3 feet
Area scale
= (1 in)²: (3 ft)²
= 1 in²: 9 ft²
This means that 1 in² of the drawing represents an actual area of 9 ft².
Area of garden in the drawing
= 5(3.5)
= 17.5 in²
Area of actual garden
= 17.5 ×9
= 157.5 ft²
Thus, the answer is E.
A circular plate has circumference 21.4 inches. What is the area of this plate? Use 3.14 for pi.
Answer:
The area of this plate is [tex]36.31\ \text{inches}^2[/tex].
Step-by-step explanation:
We have,
Circumference of a circular plate, C = 21.4 inches
The circumference of a circular shape is given by :
[tex]C=2\pi r[/tex]
r is radius of circular shape
[tex]r=\dfrac{C}{2\pi}\\\\r=\dfrac{21.4}{2\times 3.14}\\\\r=3.4\ \text{inches}[/tex]
Area of this plate is given by :
[tex]A=\pi r^2\\\\A=\pi (3.4)^2\\\\A=36.31\ \text{inches}^2[/tex]
So, the area of this plate is [tex]36.31\ \text{inches}^2[/tex].
A segment XD is drawn in rectangle QUAD as shown
below.
What are the measures of ZXDQ and ZUXD ?
mZ XDQ=
mZ UXD =
–
–
–
–
–
–
–
–
Answer:
41 and 139
Step-by-step explanation:
the answers are 41 and 139
Evaluate 6²-7²+8²-9²+..+998²-999²
Answer:
-499,485.
Step-by-step explanation:
We can transform this to an arithmetic series by working it out in pairs:
6^2 - 7^2 = (6-7)(6+7) = -13
8^2 - 9^2 = (8-9)*8+9) = -17
10^2 - 11^2 = -1 * 21 = -21 and so on
The common difference is -4.
The number of terms in this series is (998 - 6) / 2 + 1
= 992/2 + 1 = 497.
Sum of n terms of an A.S:
= n/2 [2a1 + (n - 1)d
Here a1 = -13, n = 497, d = -4:
Sum = (497/2)[-26 - 4(497-1)]
= 497/2 * -2010
= -499,485.
What is the minimum amount of information you need in
order to calculate the slope of a line?
A. The x and y intercepts of the line.
B. Any two points along the line.
C. The length of the line.
D. The endpoints of the line,
NEED THIS BY TODAY PLZZZZ!!!!! BE SURE OF YOU ANSWER
To calculate the slope of a line we require any two points along the line.
Explanation:
suppose two points are given that is (x1,y1) (x2, y2) . The equation of a line is y-y1=m(x-x1) , where m is referred to as the slope of the line .
To find m,
m= y2-y1/x2-x1 . Hence this way of finding slope is known as point- slope form. Another form is there known as slope- intercept form
y=mx+c.
But to find a slope , minimum amount of information that we require is points along the line.
Final answer:
To calculate the slope of a line, only two points on the line are needed. Slope is computed as the difference in y-coordinates divided by the difference in x-coordinates of these points.
Explanation:
To calculate the slope of a line, the minimum amount of information needed is any two points along the line. The slope is the rate of change between two points on a line and can be calculated using the formula slope (m) = (Y₂ - Y₁) / (X₂ - X₁), where Y₂ and Y₁ are the y-coordinates and X₂ and X₁ are the x-coordinates of the two points. It is not necessary to know the length of the line, the endpoints specifically, or the x and y intercepts separately.
The slope-intercept form of a linear equation, y = mx + b, shows that m is the slope and b is the y-intercept. Here, the y-intercept is simply the point where the line crosses the y-axis, but it is not required for calculating the slope when you have two points on the line.
what is the domain for y=3
Answer:
The domain is all real numbers
Step-by-step explanation:
The domain is the input values
y= 3 is a horizontal line across all x
The domain is all real numbers
The domain is all real numbers.
The domain is the possible values for x that result in a valid equation, no dividing by zero or any of that stuff. Here there's no x in the formula, y=3 is a horizontal line, f(x)=3 for all x. No x in the formula means it works for all x; nothing to go wrong.
The following distribution is not a probability distribution because
the probability values are not discrete.
the values of the variable are negative
the probability values are not increasing
the probability values do not add to 1.
Answer:
Choice 2
Step-by-step explanation:
The following distribution is not a probability distribution because the probability values do not add to 1.
If it were a probability distribution, the sum of all the probability values would be equal to 1.
The sum of the probability values is 0.16 + 0.15 + 0.42 + 0.13 + 0.31,
which is equal to 1.17.
Since the sum is greater than 1, it violates the requirement for a probability distribution.
Hence, the probability values do not add to 1.
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simplify. Write the answer with positive exponents. (3x^4y^5) / (21xy^5) (14x^3y^3)/(2xy^8) someone help please
Which could be the length of BC?
11 ft
13 ft
15 ft
18 ft
Answer:D
Step-by-step explanation: Got it right on the test
is y=1-x a linear equation
Answer:
Yes
Step-by-step explanation:
It can be rewritten as y = -x + 1.
The slope is -1 and the y-intercept is (0,1)
Final answer:
The equation y=1-x is indeed a linear equation, fitting the general form y = a + bx with a slope of -1 and y-intercept of 1.
Explanation:
Yes, y=1-x is a linear equation. In general, a linear equation can be written in the form y = a + bx, where a is the y-intercept and b is the slope. In this case, the equation y=1-x can be rewritten as y = (-1)x + 1, which clearly fits the form of a linear equation with a slope of -1 and a y-intercept of 1.
The graph of a linear equation is a straight line, and the equation y=1-x represents a straight line with a downward slope. Unlike nonlinear equations, such as y=xb where b is a power, linear equations represent a direct proportionality between y and x.
For a standard normal distribution, find the approximate value of P(z≤0.42). Use the portion of the standard normal table below to help answer the question.
0.00
0.22
0.32
0.42
0.44
0.64
0.84
1.00
Probability
0.5000
0.5871
0.6255
0.6628
0.6700
0.7389
0.7995
0.8413
O
A. 16%
B. 34%
C. 66%
D. 84%
We have been given that a z-score table and corresponding probability to each z-score. We are asked to find the probability of a getting a z-score less than or equal to 0.42 that is [tex]P(z\leq0.42)[/tex].
z-score Probability
0.00 0.5000
0.22 0.5871
0.32 0.6255
0.42 0.6628
0.44 0.6700
0.64 0.7389
0.84 0.7995
1.00 0.8413
Upon looking at our given table, we can see that the probability corresponding to z-score of 0.42 is 0.6628.
[tex]P(z\leq0.42)=0.6628[/tex]
Now, we will convert [tex]0.6628[/tex] into percent as:
[tex]0.6628\times 100\%=66.28\%[/tex]
Upon rounding to nearest percent, we will get:
[tex]66.28\%\approx 66\%[/tex]
Therefore, the approximate value of [tex]P(z\leq0.42)[/tex] is [tex]66\%[/tex] and option C is the correct choice.
Answer:
C
Step-by-step explanation:
What is the slope of a line that passes through the points
(-2, -7) and (-6, -2)?
Hope this will help u...
Look at the attached picture ⤴⤴
Mikiah must choose between a pack of four 6.5-ounce containers of ice cream for $3.77 or a pack of three 8-ounce containers for $3.87. Which is the better buy? Why?
Answer:
a pack of three 8-ounce containers his is a better purchase
Step-by-step explanation:
In this case, what we must do is calculate the price per ounce and the one with the best value is the best purchase:
option 1: a pack of four 6.5-ounce containers of ice cream for $ 3.77
3.77 / (4 * 6.5) = 0.145
option 2: a pack of three 8-ounce containers for $ 3.87
3.87 / (3 * 8) = 0.161
The value of the price per ounce is less in option 1, therefore, this is a better purchase
Antonia bought a set of dishes, a towel, and a candle at a housewares store. The set of dishes cost $35.10, the towel cost $21.28, and the candle cost $9.53 before any coupons or discounts. She used a $0.50-off coupon on the candle, a $2.75-off coupon on the towel, and the set of dishes was on sale for 10% off the regular price. Which of the following best describes the amounts that Antonia saved? a. she saved the greatest percentage on the set of dishes b. she saved the greatest percentage on the towel c. she saved the greatest percentage on the candle d. she saved the same percentage on the towel and the set of dishes.
Answer:
A
Step-by-step explanation:
Since $2.75 discount is given on towel
$0.5 discount is given on candle
10% discount is given on set of dishes
We will have to calculate the discount for the set of dishes
10% of $35.10
10/100 ×35.10
=35.1
So the discount on the set of dishes is $35.1
When comparing the discount on the three things she bought,it was observed that she gained a lot from the discount given on the set of dishes
So the answer is A
Rebecca is making bracelets to sell at a charity event. Each bracelet takes 1 1/4 of a foot of embroidery floss to make.If Rebecca has five yards of embroidery floss,how many bracelets can she make?
Answer:
12
Step-by-step explanation:
She has 15 feet of floss. 15/1.25 is 12.
Hope this helps!!
Answer:
15
Step-by-step explanation:
She has 15 feet of floss
A 45 foot ladder is leaning against a building. The foot of the ladder is positioned 10 feet from the base of the building. Determine the angle at which the ladder meets the ground
Solution:
Given that,
A 45 foot ladder is leaning against a building
The foot of the ladder is positioned 10 feet from the base of the building
The figure is attached below
Let,
AB = foot of the ladder from the base of the building
AB = 10 feet
AC = length of ladder
AC = 45 feet
Then by definition of cos,
[tex]cos\ \theta = \frac{AB}{AC} \\\\cos\ \theta = \frac{10}{45}\\\\\theta = cos^{-1} 0.222 \\\\\theta = 77.17[/tex]
Thus, the angle at which the ladder meets the ground is 77.17 degree
graph the line that has an x intercept (-3,0) and y intercept (0,-5)
Answer:
Step-by-step explanation:
Plot points at the given points and connect with a line.
if it takes 20 farmers 36 days to harvest their fruits, how long would it take 30 farmers to harvest the same amount of fruit ?
Answer:
24 days
Step-by-step explanation:
the information we have is:
Farmers Days
20 ⇒ 36
30 ⇒ x
the table describes that 20 farmers harvest the fruits in 36 days, and the x represents the quantity of days that will take 30 farmers to harvest the fruits.
since the amount of farmers and the amount of days are inversely proportional (if we have more farmers they will need less days, and the other way around) we use the inverse rule of three to solve this problem: multiply the quantities at the top of the table (20 and 36) and divide the result by the remaining amount (30).
we get the following:
x = 20 * 36 / 30
x = 720 / 30
x = 24
It will take 24 days for the 30 farmers to harvest the same amount of fruit
Use the original price and the markdown to find the retail price.
Original price: $40; Markdown: 16%
Answer:
$33.6.
Step-by-step explanation:
40 x .16 = 6.4
40 - 6.4 = 33.6.
Feel free to let me know if you need more help. :)
HELP PLEASE
Identify a, b, and c in the following quadratic equation 2x2+24=−4x.
Answer:
term a is 2x²
term b is 4x
term c is 24
Step-by-step explanation:
2x² + 24 = -4x
2x² + 4x + 24 = 0
term a is 2x²
term b is 4x
term c is 24
Tell me if I am wrong.
Can I get brainliest
Need help..................
Answer:
(4-7x)(4+7x)
Step-by-step explanation:
This is a difference of squares. (16 is the square of 4, 49x^2 is the square of 7x.)
The formula for difference of squares is a^2 - b^2 = (a-b)(a+b)
16 - 49^2 = (4-7x)(4+7x)
What is the equation of the axis of symmetry for the graph?
Answer:
-b/2a
Step-by-step explanation:
Based on the scale drawing, what is the length, in feet, of the actual parking lot?
Answer:
No one can help
Step-by-step explanation:
You did not provide the scale drawing
What is (3 - 3i)(-5 - 4) in the form a + bi?
Answer:
Hey
Step-by-step explanation:
Answer:
-27+27i
Step-by-step explanation:
you are trying to simplify this and have to follow pemdas and rearrange it into a+bi form
In the diagram, the measure of angle 1 is (3x), and the measure of angle 2 is (12x)".
516
87
What is the measure of angle 4?
Answer:
Angle 4 is 144.
Step-by-step explanation:
Applying the definition of vertical angles, the measure of angle 4 is: 144°.
What are Vertical Angles?Vertical angles are a pair of angles that lie directly opposite each other and are equal in measure to each other.
m∠1 + m∠2 = 180° (linear pair)
Substitute
3x + 12x = 180
15x = 180
x = 12
∠4 and ∠2 are vertical angles, therefore:
m∠4 = m∠2 = 12x
Plug in the value of x
m∠4 = 12(12)
m∠4 = 144°
Therefore, applying the definition of vertical angles, the measure of angle 4 is: 144°.
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Given: F(x) = 2x - 1; G(x) = 3x + 2; H(x) = x2
Find F{G[H(2)]}
Answer:
Step-by-step explanation:
hello :
Given: F(x) = 2x - 1; G(x) = 3x + 2; H(x) = x2
Find F{G[H(2)]}
calculate : H(2) =2² =4
G[H(2)] =G[4]= 3(4)+2 =14
F{G[H(2)]} = F{14}=2(14) =28
earth moves in a orbit that is 585 million miles away from the sun.Write 585 million in scientific notation form.
Answer: 5.85 x 10 to the power of 6
Step-by-step explanation:
Explain to me the strategy that you use to order a group of numbers that may be written in different forms, for example percentages, decimals, and fractions.
Answer:
Convert fractions, decimals, and percents to the same form to compare the values. Convert Percent to Decimal or Fraction. Convert Decimal to Percent or Fraction. Convert Fraction to Decimal or Percent. Then figure out which is greater or lesser. Use this information to write a set of numbers or quantities in order from least to greatest or from greatest to least.
Step-by-step explanation:
Ordering numbers mean plan of numbers either from little to enormous or from huge to little. At the point when the numbers are orchestrated in an expanding order, it is known as Ascending Order, and when the numbers are organized in a diminishing order, and afterward they are known as Descending Order. For ascending, check the most modest number from the given rundown and spot it first and afterward put the numbers as indicated by the expanding order. For descending check the greatest number from the given rundown and spot it first and afterward put the numbers as per the diminishing order.
A percentage is a part of an entire communicated as a number somewhere in the range of 0 and 100 instead of as a portion. All of something is 100 percent, half of it is 50%, none of something is zero percent.
A decimal is a part written in an extraordinary structure. Rather than composing 1/2, for instance, you can communicate the division as the decimal 0.5, where the zero is during the ones spot and the five is in the tenths spot.
A fraction just discloses to us what number of parts of an entire we have. You can perceive a fraction by the slice that is composed between the two numbers. We have a top number, the numerator, and a base number, the denominator. For instance, 1/2 is a fraction. You can compose it with an inclined slice like we have or you can compose the 1 on the 2 with the slice between the two numbers. The 1 is the numerator, and the 2 is the denominator.
A playground 96 ft long and 48 ft wide is to be resurfaced at a cost of $4.75 per sq ft. What will the resurfacing cost?
Answer:
$21888
Step-by-step explanation:
96*48=4608
4608*$4.75=21888
The cost to do the resurfacing of the playground can be found to be $21, 888.
How to find the cost ?To find the cost of resurfacing the playground, you need to calculate the total area of the playground and then multiply it by the cost per square foot.
The playground is 96 feet long and 48 feet wide, so its area is:
Area = Length × Width
Area = 96 ft × 48 ft
Area = 4,608 square feet
Multiply the area by the cost per square foot:
Resurfacing Cost = Area × Cost per square foot
Resurfacing Cost = 4,608 sq ft × $4.75/sq ft
Now, calculate the resurfacing cost:
Resurfacing Cost = $ 21,888
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