Answer:
x = 2/3 , y = -23/12
Step-by-step explanation:
Solve the following system:
{-7.5 x - 1.2 y = -2.7
{1.2 y - 1.5 x = -3.3
In the first equation, look to solve for x:
{-7.5 x - 1.2 y = -2.7
{1.2 y - 1.5 x = -3.3
-7.5 x - 1.2 y = -(15 x)/2 - (6 y)/5 and -2.7 = -27/10:
{-(15 x)/2 - (6 y)/5 = -27/10
Add (6 y)/5 to both sides:
{-(15 x)/2 = 3/10 (4 y - 9)
{1.2 y - 1.5 x = -3.3
Multiply both sides by -2/15:
{x = 1/25 (9 - 4 y)
{1.2 y - 1.5 x = -3.3
Substitute x = 1/25 (9 - 4 y) into the second equation:
{x = 1/25 (9 - 4 y)
{1.2 y - 0.06 (9 - 4 y) = -3.3
1.2 y - 0.06 (9 - 4 y) = 1.2 y + (0.24 y - 0.54) = 1.44 y - 0.54:
{x = 1/25 (9 - 4 y)
{1.44 y - 0.54 = -3.3
In the second equation, look to solve for y:
{x = 1/25 (9 - 4 y)
{1.44 y - 0.54 = -3.3
1.44 y - 0.54 = (36 y)/25 - 27/50 and -3.3 = -33/10:
(36 y)/25 - 27/50 = -33/10
Add 27/50 to both sides:
{x = 1/25 (9 - 4 y)
{(36 y)/25 = -69/25
Multiply both sides by 25/36:
{x = 1/25 (9 - 4 y)
{y = -23/12
Substitute y = -23/12 into the first equation:
Answer: x = 2/3 , y = -23/12
Answer:
x = 2/3 y = -23/12
Step-by-step explanation:
- 7.5x - 1.2y = -2.7
- 1.5x + 1.2y = -3.3
Add the equations together
- 7.5x - 1.2y = -2.7
- 1.5x + 1.2y = -3.3
---------------------------
-9x = -6
Divide each side by -9
-9x/-9 =-6/-9
x =2/3
Now we need to find y
-1.5 (2/3) +1.2y = -3.3
-1 +1.2y = -3.3
Add 1 to each side
-1+1 +1.2y = -3.3+1
1.2y = -2.3
Divide by 1.2
1.2y/1.2 = -2.3/1.2
y =-23/12
A decorator wants to line the bottom of 3 drawers with paper. If the bottom of each drawer measures 36 inches by 20 inches,
how many square inches of paper are needed?
A 1,040
B
1,080
C 2,040
D
2,160
Answer:
2160
Step-by-step explanation:
36*20=720 720*3=2160
To find the number of square inches of paper needed, multiply the length and width of each drawer to get the area, and then multiply that area by 3.
Explanation:To find the number of square inches of paper needed, we need to find the area of the bottom of each drawer and then add them together. The area of a rectangle is found by multiplying its length by its width. So, for each drawer, we multiply 36 inches by 20 inches to get an area of 720 square inches.
Since there are 3 drawers, we need to multiply the area of one drawer by 3. So, the total number of square inches of paper needed is 720 square inches times 3, which equals 2160 square inches.
Therefore, the correct answer is D) 2160.
solve 7r+ 2 = 5(r – 4)
Multiply the bracket by 5
I used PEMDAS
P= parenthesis
E= exponents
M=multiplication
D= division
A= addition
S= subtraction
7r+2= 5(r-4)
7r+2= 5r-20
Move 5r to the left hand side . Positive 5r changes to negative 5r
7r-5r+2= 5r-5r-20
2r+2=- 20
2r+2-2= -20-2
Move positive 2 to the right hand side. Changes to negative -2
2r+2-2= -20-2
2r= -22
Divide by 2 for 2r and -22
2r/2= -22/2
r= -11
Answer is r= -11
Answer:
r = (-11)
Step-by-step explanation:
7r + 2 = 5(r – 4)
7r + 2 = 5r – 4 * 5
7r + 2 = 5r – 20
7r - 5r = -20 - 2
2r = -22
r = -22/2 = (-11)
Does 3 to the 2 power plus 3 to the 3 power equal 3 to the 5 power?
Please Explain!
3 to the 2nd power plus 3 to the 3rd power does not equal 3 to the 5th power. In actuality, 3^2 + 3^3 = 36, while 3^5 = 243.
Explanation:No, 3 to the 2nd power plus 3 to the 3rd power does not equal 3 to the 5th power. This is a common misconception when dealing with exponents. To clear this up, let's look at what these expressions actually mean:
3 to the 2nd power (3^2) = 3*3 = 9
3 to the 3rd power (3^3) = 3*3*3 = 27
So, 3^2 + 3^3 = 9 + 27 = 36
However, 3 to the 5th power (3^5) = 3*3*3*3*3 = 243
So, as you can see, 36 does not equal 243.
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Question 1 of 25
2 Points
Suppose the linear regression line y = 2.1x + 130 predicts sales based on the
money spent on advertising. If x represents the dollars spent in advertising,
and y represents the company sales in dollars, about how much can the
company expect in sales if it spends $50 in advertising?
O A. $650
O B. $235
O C. $105
O D. $323
SUBMIT
Point C and point D are plotted on the graph. Plot points A and B to form rectangle ABDC with an area of 36 square units. Plot point E at (2, 4).
Step-by-step explanation:
pt C is (-4,-4)
pt D is (2,-4)
length of CD is 6 units
to form a rectangle AB must be parallel to CD, AC must be parallel to BD and AC and BD must be 6 units
Therefore...A =(-4, 2) and B = (2, 2)
What equation results from completing the square and then factoring?
x2 - 8x = 39
O A. (x-8)2 = 55
O B. (X-8)2 = 23
O C. (x-4)2 = 23
O D. (x-4)2 = 55
Answer:
[tex]\large\boxed{D.\ (x-4)^2=55}[/tex]
Step-by-step explanation:
[tex](a-b)^2=a^2-2ab+b^2\qquad(*)\\\\\\x^2-8x=39\\\\x^2-2(x)(4)=39\qquad\text{add}\ 4^2=16\ \text{to both sides}\\\\\underbrace{x^2-2(x)(4)+4^2}_{(*)}=39+16\\\\(x-4)^2=55[/tex]
Answer: the answer is D
Step-by-step explanation:
A study determined that there is a strong correlation between getting less than 8 hours of sleep a day and lower test scores. Can it be determined that the low test scores are caused by sleep deprivation? Explain.
A) Causation cannot be proven because lower test scores can occur for other reasons, such as not studying or poor attendance.
B)Causation cannot be proven because all students get less than 8 hours of sleep.
C)Causation can be proven because it is well known that less sleep lowers test scores.
D)Causation can be proven because an experiment was used to prove this hypothesis.
Answer:
Option A (Causation cannot be proven because lower test scores can occur for other reasons, such as not studying or poor attendance).
Step-by-step explanation:
Correlation is a concept which explains a linear relationship between two variables. The correlation constant lies between -1 and 1. 0 lies in the center of the interval. A negative correlation means an inverse relationship, and a positive correlation means a direct relationship. 0 technically means no linear relation between the variables. Further the correlation constant lies from 0, more the strength of the relationship. It is important to note that correlation shows a relationship between the two variables but it cannot determine the causation i.e. it cannot be concluded that one variable caused the other variable to occur. Even though having a strong correlation does not mean causal relationship. Therefore, correlation does not prove causation. This is because there are several other lurking and unobserved variables which affect the observed variables. The former class of variables are not accounted for in the correlation. Therefore, the exact magnitude of the causal relationship cannot be determined. Therefore, Option A is the correct choice!!!
Answer:
OPTION A: Causation cannot be proven because lower test scores can occur for other reasons, such as not studying or poor attendance.
Step-by-step explanation: I got it right on the test.
Which linear inequality is represented by the graph?
A. y < x + 3
B. y > x + 3
C. y > x + 3
D. y < x + 3
Answer:
The correct answer option is C. [tex]y>\frac{2}{3}x+3[/tex].
Step-by-step explanation:
We are given a graph and we are to determine whether which linear inequality is represented by the graph.
We know that the grey part on the graph represents the the region which is not included in the inequality.
Also, when x = 0, the values of y can only be less than 3.
So we choose two points on the graph and we find the slope.
For example, we take the points [tex](0,3)[/tex] and [tex](3,5)[/tex].
Slope = [tex]\frac{5-3}{3-0} =\frac{2}{3}[/tex]
which makes the equation of the line [tex]y=\frac{2}{3}x+3[/tex] and inequality [tex]y>\frac{2}{3}x+3[/tex].
I need bad can someone help
Answer:
6x + 8y
Step-by-step explanation:
Distribute 2:
Note: This means to multiply 2 with the numbers inside the parentheses.
2 * 3x = 6x
2 * 4y = 8y
Our answer would be 6x +8y
Answer:
I think A and C are because they all go back to the original equation.
Step-by-step explanation:
Hope my answer has helped you and if not i'm sorry.
Line l passes through the point of intersection,A, of the lines 4x-3y+4=0 and x+2y=5. Without finding A,find the equation of line l if its y-intercept is 1.5
Answer:
[tex]\large\boxed{y=\dfrac{15}{14}x+1.5}[/tex]
Step-by-step explanation:
The slope-intercept form of an equation of a line:
[tex]y=mx+b[/tex]
m - slope
b - y-intercept
------------------------------------------------------------------------
You must solve the system of equations:
[tex]\left\{\begin{array}{ccc}4x-3y+4=0&(1)\\x+2y=5&(2)\\y=mx+1.5&(3)\end{array}\right\qquad\text{substitute (3) to (1) and (2)}\\\\\left\{\begin{array}{ccc}4x-3(mx+1.5)+4=0\\x+2(mx+1.5)=5\end{array}\right\qquad\text{use the distributive property}\\\left\{\begin{array}{ccc}4x-3mx-4.5+4=0\\x+2mx+3=5&\text{subtract 3 from both sides}\end{array}\right\\\left\{\begin{array}{ccc}4x-3mx-0.5=0&\text{add 0.5 to both sides}\\x+2mx=2\end{array}\right\\\left\{\begin{array}{ccc}4x-3mx=0.5&\text{multiply both sides by 2}\\x+2mx=2&\text{multiply both sides by 3}\end{array}\righ[/tex]
[tex]\underline{+\left\{\begin{array}{ccc}8x-6mx=1\\3x+6mx=6\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad11x=7\qquad\text{divide both sides by 11}\\.\qquad x=\dfrac{7}{11}\\\\\text{Put the value of}\ x\ \text{to the second equation:}\\\\\dfrac{7}{11}+2m\left(\dfrac{7}{11}\right)=2\qquad\text{multiply both sides by 11}\\\\7+2m(7)=22\qquad\text{subtract 7 from both sides}\\\\14m=15\qquad\text{divide both sides by 14}\\\\m=\dfrac{15}{14}[/tex]
Find the values of X and Y
Answer:
see explanation
Step-by-step explanation:
Using the exact values of the trigonometric ratios
sin30° = [tex]\frac{1}{2}[/tex], cos30° = [tex]\frac{\sqrt{3} }{2}[/tex]
Then
sin30° = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{17}{y}[/tex] = [tex]\frac{1}{2}[/tex]
Cross- multiply
y = 2 × 17 = 34
cos30° = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{x}{y}[/tex] = [tex]\frac{x}{34}[/tex] and
[tex]\frac{x}{34}[/tex] = [tex]\frac{\sqrt{3} }{2}[/tex] ( cross- multiply )
2x = 34[tex]\sqrt{3}[/tex] ( divide both sides by 2 )
x = 17[tex]\sqrt{3}[/tex]
Hence
x = 17[tex]\sqrt{3}[/tex] and y = 34
I NEED HELP PLEASEE
[tex]\bf \cfrac{1+cot^2(\theta )}{1+csc(\theta )}=\cfrac{1}{sin(\theta )} \\\\[-0.35em] ~\dotfill\\\\ \cfrac{1+cot^2(\theta )}{1+csc(\theta )}\implies \cfrac{1+\frac{cos^2(\theta )}{sin^2(\theta )}}{1+\frac{1}{sin(\theta )}}\implies \cfrac{~~\frac{sin^2(\theta )+cos^2(\theta )}{sin^2(\theta )}~~}{\frac{sin(\theta )+1}{sin(\theta )}}\implies \cfrac{~~\frac{1}{sin^2(\theta )}~~}{\frac{sin(\theta )+1}{sin(\theta )}}[/tex]
[tex]\bf \cfrac{1}{\underset{sin(\theta )}{~~\begin{matrix} sin^2(\theta ) \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~ }}\cdot \cfrac{~~\begin{matrix} sin(\theta ) \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}{sin(\theta )+1}\implies \cfrac{1}{sin^2(\theta )+sin(\theta )} \\\\[-0.35em] ~\dotfill\\\\ ~\hfill \cfrac{1+cot^2(\theta )}{1+csc(\theta )}\ne \cfrac{1}{sin(\theta )}~\hfill[/tex]
What is the sum of the measures, in degrees, of the interior angles of a 16- sided polygon?
Answer: So the sum of all of the measures of the interior angles of a 16-sided polygon is 2520 degrees.
The sum of the interior angles of a 16-sided polygon is 2520 degrees.
The sum of the interior angles of a 16-sided polygon, or hexadecagon, is 2520 degrees, which can be calculated using the formula (n-2) x 180 degrees.
The sum of the interior angles of any polygon can be found using the formula (n-2) imes 180 degrees, where n is the number of sides of the polygon. A 16-sided polygon is known as a hexadecagon. Using the formula, we have:
Sum of interior angles = (16-2) imes 180 degrees
Sum of interior angles = 14 imes 180 degrees
Sum of interior angles = 2520 degrees
Therefore, the sum of the interior angles of a 16-sided polygon is 2520 degrees.
What is the factorization of 81a6 -100
Answer:
see explanation
Step-by-step explanation:
81[tex]a^{6}[/tex] - 100 ← is a difference of squares which factors in general as
a² - b² = (a - b)(a + b)
81[tex]a^{6}[/tex] = (9a³ )² ⇒ a = 9a³ and 100 = 10² ⇒ b = 10
Hence
81[tex]a^{6}[/tex] - 100
= (9a³)² - 10²
= (9a³ - 10)(9a³ + 10)
Answer:
C
Step-by-step explanation:
Unit Test Is a pain I know
is (0,0) a solution to this system y2x-1
(0,0) satisfies y > 2x - 1 but does not satisfy y ≤ x^2 - 4. C
(0,0) satisfies both inequalities.
michelle and rosa are researching the deepest lakes in the united states for a school project. lake tahoe has a depth of 1,644 feet. michelle believes the lake has a depth of 548 meters. rosa believes the lake has a depth of 498 meters. who do you agree with ?
Answer:
Rosa is closer to the correct depth.
Step-by-step explanation:
To show that two measurements are nearly equivalent, we must convert one of the measurements to the other unit.
1 m = 3.281 ft
[tex]\text{Depth } = \text{1644 ft} \times \dfrac{\text{1 m}}{\text{3.281 ft}} = \textbf{501.1 m}[/tex]
Neither is correct but Rosa is closer to the correct depth.
How do you solve and graph this equation
Answer:
The graph is in the attachmentStep-by-step explanation:
<, > - dotted line
≤, ≥ - solid line
<, ≤ - shaded region below a line or to the left if is a vertical line
>, ≥ - shaded region above a line or to the right if is a vertical line
----------------------------------------------------------
We have x ≥ 4:
solid vertical line x = 4
shaded region to the right
Please help ASAP this is all due today
Answer:
x = 7.5
Step-by-step explanation:
Given
- 15 = [tex]\frac{x}{-0.5}[/tex]
Multiply both sides by - 0.5
- 0.5 × - 15 = x, hence
x = 7.5
Answer:
7.5.
Step-by-step explanation:
-15 = x / -0.5
Cross multiplying:
x = -15 * -0.5
= 7.5.
Which answer is the explicit rule for the sequence 2,9,16,23,30...
Answer:
see explanation
Step-by-step explanation:
These are the terms of an arithmetic sequence
The n th term ( explicit rule ) for an arithmetic sequence is
[tex]a_{n}[/tex] = a₁ + (n - 1)d
where a₁ is the first term and d the common difference
d = 9 - 2 = 16 - 9 = 23 - 16 = 30 - 23 = 7 and a₁ = 2, hence
[tex]a_{n}[/tex] = 2 + 7(n - 1) = 2 + 7n - 7 = 7n - 5
The explicit rule for the sequence 2,9,16,23,30... is 7n - 5
How to write explicit rule for a sequence2,9,16,23,30
First term, a = 2Common difference, d = 9 - 2= 7
The explicit rule is defined by
nth term = a + (n - 1) d
= 2 + (n - 1)7
= 2 + 7n - 7
= 7n - 5
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What was the range of snowfall in Denver?
Answer:
7.6 inches
Step-by-step explanation:
First of all we have to define range.
Range gives us the difference of two values between which the data is spread.
the formula for range is:
Range = Highest value - lowest value
By observing the diagram, we can see that
The highest value is = 8.5 inches
The lowest value is: 0.9 inches
So,
Range = 8.5 - 0.9
= 7.6 inches
So, the range is 7.6 inches ..
Could you guys help me with number 4
Answer:
c
Step-by-step explanation:
Please help ASAP it is due in 5 mins
Answer:
z = 5
Step-by-step explanation:
Given
- 0.25z = - 1.25 ( divide both sides by - 0.25
z = [tex]\frac{-1.25}{-0.25}[/tex] = 5
z = 5
Answer:
z = 5.
Step-by-step explanation:
-0.25 z = -1.25
z = -1.25 / -0.25
z = 5.
The probability that the fraction will be greater than 5/6
Answer:
11/16
Step-by-step explanation:
You could list all the possible fractions you will get:
Here are the's with 4 as the numerator:
4/4
4/5
4/6
4/7
Here are the one's with 5 as the numerator:
5/4
5/5
5/6
5/7
Here are the one's with 6 as the numerator:
6/4
6/5
6/6
6/7
Here are the one's with 7 as the numerator:
7/4
7/5
7/6
7/7
There are 4(4) different numerator-denominator combinations we can get.
Let's see which of these are bigger than 5/6.
If you think it is easier to look at the decimals of all these you can.
5/6=0.8333333333
----
4/4 =1
4/5 =0.8
4/6 =0.6666666666
4/7 =0.5714 (approximately)
There is only 1 bigger than 5/6 in this section.
5/4 =1.25
5/5 =1
5/6 =0.83333333333
5/7 =0.714 (approximately)
There is 2 bigger than 5/6 in this section.
6/4 =1.5
6/5 =1.2
6/6 =1
6/7 =0.857 (approximately)
There is 4 bigger than 5/6 in this section.
7/4
7/5
7/6
7/7
All of these are 1 or bigger because the numerator is bigger than or equal to the denominator so all 4 of these are bigger than 5/6 in this section.
P(fraction being greater than 5/6)=[\tex]\frac{\text{ the numbers I listed bigger than } \frac{5}{6}}{\text{ all the fractions I listed }}[/tex]
P(fraction being greater than 5/6)=[\tex]\frac{4+4+2+1}{4(4)}=\frac{11}{16}{/tex]
11/16
Answer:
1/6 or 11/16
Step-by-step explanation:
If you spin a spinner with the first spin giving the numerator and the second spin giving the denominator of a fraction, the probability of the fraction will be greater is 1/6 or 11/16.
6 - 5/6 = 1/6
However, there are 4 possible spots you could land on so, it would change to 11/16.
which of the following is a polynomial with roots 3,5i, and -5i
f(x)=x^3-3x^2+25x-75
f(x)=x^3-3x^2+15x-25
f(x)=x^3-15x^2+25x-75
f(x)=x^3-3x^2+15x-75
Answer:
f(x)=x^3-3x^2+25x-75
Step-by-step explanation:
Solve for x:
x^3 - 3 x^2 + 25 x - 75 = 0
The left hand side factors into a product with two terms:
(x - 3) (x^2 + 25) = 0
Split into two equations:
x - 3 = 0 or x^2 + 25 = 0
Add 3 to both sides:
x = 3 or x^2 + 25 = 0
Subtract 25 from both sides:
x = 3 or x^2 = -25
Take the square root of both sides:
Answer: x = 3 or x = 5 i or x = -5 i
Please help I don’t know this!!!
Answer:
F
Step-by-step explanation:
∠C is opposite ( or across from ) side AB
In the same way
∠A is opposite side BC and
∠B is opposite side AC
An aquarium measures 11 feet wide, 10 feet long and 7 feet deep. Approximately how many gallons of water does it hold if there are 7.48 gallons per cubic foot of water?
The aquarium, which has a volume of 770 cubic feet, can hold approximately 5,760 gallons of water when taking into consideration the conversion rate of 7.48 gallons per cubic foot.
Explanation:To calculate the volume of water an aquarium can hold, we need to first calculate the volume of the aquarium itself, which is determined by multiplying the length, width, and height together. In this case, we have an aquarium that measures 11 feet wide, 10 feet long and 7 feet deep, so multiplying these dimensions together gives us a volume of 770 cubic feet.
Next, we need to convert this volume into gallons. We're given the conversion rate of 7.48 gallons per cubic foot of water, so we multiply our previously obtained volume by this rate. This gives us: 770 cubic feet * 7.48 gallons per cubic foot, which equals 5,759.6 gallons.
So, the aquarium can hold approximately 5,760 gallons of water.
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help pleaseee !!!! which description matches the function represented by this graph
Answer:
D. Linear decay.
Step-by-step explanation:
The data decays and lowers.
Answer with explanation:
If you will look at the graph of function, it is not a straight line.
Horizontal Asymptote is, y=0.
There is no vertical Asymptote.
Either it can be growth function or decay function.
But , if you will look at the graph of growth function, it begins from negative infinity and then starts increasing.
In this case graph is decreasing function.
So, The function represents
Option C:→ Exponential Decay
What is the value of x x=2.25
X=11.25
Answer:
2.25
Step-by-step explanation:
Answer:
x = 2.25
Step-by-step explanation
using process of elimination the only viable answer is 2.25
WILL PICK BRAINLIEST!!!!!!
Mrs. Hanger is painting the following picture of an H to hang in the entryway of her home. She has made the following scale drawing as her model. The scale used on the drawing is 1:6.
As you can see, the "H" is going to be painted brick red in the center of a rectangular beige background. This means the distance from the "H" to the top of the picture will be the same as the distance from the "H" to the bottom of the picture. Similarly, the distance from the "H" to the left side of the picture will be the same as the distance from the "H" to the right side of the picture. Finally, each segment of the "H" will have the same width.
1. What is the actual width of the painting? ________ inches
2. What is the actual height of the painting? ________inches
3. On the scale drawing, the top edge of the "H" is 5/6 inches from the top edge of the drawing. What is the actual height of the "H"? _________ inches
4. What is the actual width of the "H" (through the center)? ________inche
5. What is the actual distance from the left edge of the painting to the left edge of the "H"? _________inches
Answer:
1. 24
2. 30
3. 20
4. 12
5. 6
If you travel 720 miles in 12 hours, which of the following is the amount of time it would take you to travel 360 miles?
Answer:
6 Hours
Step-by-step explanation:
360 is half of 720, so it would take half the time to travel. half of 12 is 6
At a constant speed of 60 miles per hour, it would take 6 hours to travel 360 miles, which is a reasonable answer since the time required is halved when the distance is halved.
Explanation:The question involves calculating the time it would take to travel a certain distance given a constant speed which is a basic concept in mathematics, more specifically in the topic of rates and ratios.
If you travel 720 miles in 12 hours, you are traveling at a speed of 720 miles / 12 hours = 60 miles per hour. Now, to find out how long it would take to travel 360 miles at this constant speed, you divide the distance by the speed to get the time: 360 miles / 60 miles per hour = 6 hours. So, it would take 6 hours to travel 360 miles if you maintain the same speed.
When you check if the answer is reasonable, consider if the distance is halved, the time should also be halved if the speed remains constant. Since 360 miles is half of 720 miles, and 6 hours is half of 12 hours, the answer is indeed reasonable.