
means there exists an integer

such that

. We can divide both sides by

because

. This implies

for some integer, which is identically

.
Answer:

Step-by-step explanation:
we know that
The compound interest formula is equal to
where
A is the amount that she will repay
P is the amount borrowed
r is the rate of interest in decimal
t is Number of Time Periods
n is the number of times interest is compounded per year
in this problem we have
substitute in the formula above
Find out the interest

substitute the values

This is the answer 5(x-5) and 5x-25