The books are $16 each. To figure this problem out you have to start with the facts: Benny has $124, he buys seven books, then ends up with $12 left. So first subtract 12 from 124. That equals 112. Next divide 112 by 7, when you do that is comes out to the answer of 16! So $16 is the answer.
2.54 cm = 1 in
5 cm = 1.968503937 in
Answer: +3
Step-by-step explanation:
5 + (-2) ( + × - = - ) ∴ 5 - 2 = 3
Answer:
Given equation: ![x^2-8x =39](https://tex.z-dn.net/?f=x%5E2-8x%20%3D39)
when we complete the square , we take half of the value of 8 , then square it, and added to the left sides, we get;
![x^2-8x+4^2 = 39 +4^2](https://tex.z-dn.net/?f=x%5E2-8x%2B4%5E2%20%3D%2039%20%2B4%5E2)
∵8 is the value ![(\frac{8}{2})^2](https://tex.z-dn.net/?f=%28%5Cfrac%7B8%7D%7B2%7D%29%5E2)
Notice that, we add this both sides so that it maintains the equality.
then;
![x^2-8x+4^2 = 39 +4^2](https://tex.z-dn.net/?f=x%5E2-8x%2B4%5E2%20%3D%2039%20%2B4%5E2)
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Simplify:
![(x-4)^2 =55](https://tex.z-dn.net/?f=%28x-4%29%5E2%20%3D55)
The number must be added to complete the square is, ![4^2 = 16](https://tex.z-dn.net/?f=4%5E2%20%3D%2016)