Answer:
(21 + 11)2 = 64
So, I don't think teachers do this, but this is my way of doing it
Okay, so first, I divided 64 by 2 :
64 ÷ 2 = 32
Then, I subtracted 11 from 32:
21
Now, to check, just do the problem :
(21 + 11)2 = 64
32 * 2 = 64
Answer:
Given - Ratio of boys to girls is 3 : 1
Total 36 students
To find - No. of girls
Solution
Let the ratio be 3x and X
3x + X = 36
4x = 36
x = 36/4
x= 9
1x = 9
There are 9 girls in the class
ANSWER
b=1, c=81, and d=9.
EXPLANATION
The given function is:
![y={x}^{2}-18x](https://tex.z-dn.net/?f=y%3D%7Bx%7D%5E%7B2%7D-18x)
This function is the same as:
![y={(x - 9)}^{2}-81](https://tex.z-dn.net/?f=y%3D%7B%28x%20-%209%29%7D%5E%7B2%7D-81)
To find the inverse of this function, we interchange x and y.
![x={(y-9)}^{2}-81](https://tex.z-dn.net/?f=x%3D%7B%28y-9%29%7D%5E%7B2%7D-81)
Solve for y:
![x+81={(y- 9)}^{2}](https://tex.z-dn.net/?f=x%2B81%3D%7B%28y-%209%29%7D%5E%7B2%7D)
Take square root of both sides:
![\pm \sqrt{x + 81}=y-9](https://tex.z-dn.net/?f=%5Cpm%20%5Csqrt%7Bx%20%2B%2081%7D%3Dy-9)
![y=\pm \sqrt{x + 81}+9](https://tex.z-dn.net/?f=y%3D%5Cpm%20%5Csqrt%7Bx%20%2B%2081%7D%2B9)
Hence,
b=1, c=81, and d=9.
Given the length of the pencil, the length of the marker is 130.8 millimeters.
<h3>What are percentages?</h3>
Percentage can be described as a fraction of an amount expressed as a number out of hundred. Percentages are represented %.
<h3>How long is the marker?</h3>
Length of the marker = (1 + percentage) x length of the pencil
(1.09) x 120 = 130.8 millimeters
To learn more about percentages, please check: brainly.com/question/25764815
Y = -1/3x + b
then plug it in
-4 = (-1/3 x 6) + b. (6 times -1 divided by 3)
-4 = -2 + b. (move -2 to other side)
b = -2. (now put em all together)
y = -1/3x -2