Answer:

Step-by-step explanation:
Remember that

Let
x ----> the total cost of the books
we know that
The total cost of the book multiplied by 0.65 must be equal to $438.75
so
The linear equation that represent this situation is

solve for x

Answer:
upper and lower results have to be the same
so set them equal
5x = 2x + 1
subtract 2x on each side
3x = 1
devide each side by 3
x = 1/3
You are welcome
Its 6.174798604x10 to the 9th power
Answer:
6 1/4, 6 3/7, 6.5, 6.625
Step-by-step explanation:
6 1/4 is 6.25 so that makes it the smallest and 6 3/7 is still small and everything else is easy