Astack of books is 5 feet high of the average book is 3 inches hugh how many books are in the stack

20 books

Step-by-step explanation:

Given : A stack of books is 5 feet high of the average book is 3 inches High.

To Find: How many books are in the stack?

Solution:

1 foot = 12 inches

5 feet = inches

Height of stack = 60 inches

Height of 1 book = 3 inches

Number of books in a stack =

                                              =

                                              =

Hence,There are 20 books in a stack.

mrbilldoesmath!

answer: a parabola

steps:

(x-1)(x+4)   = x(x+4) - 1(x+4) = (x^2 + 4x) - (x+4)

                = x^2 +4x -x -4   = x^2 +3x -4

which is a parabola

mrb