Answer:
86 books
Step-by-step explanation:
A stack of books is 43 inches tall.
Each book is inch thick.
To find the number of books in tha stack, divide the height of the stack by the height of the book:
The division by the fraction is equivalent to the multiplication by the fraction so
add 21 to both sides to get everything on one side
x^2 - 10x + 21 = 0
do factorization, guess and check
(x - 7) (x -3) = 0
x =7, and x =3
Answers:
13) y + 2 = 1/4x
14) y - 1 = -2x
256h28k8
-445/month
I think that what you would do is divide -5,341 by 12, which gives you -445