Answer:

Step-by-step explanation:
Let x = number of books that Hannah donated
We know that the number of students is 150 and the total number of books is represented by b, we can write that as:
Average number of books donated by each student = 
Now we know that Hannah donated 3 times as much as the average. We can write that as:

Answer:
x=(3u)/(10y)
Step-by-step explanation:
Turn the percentage into a decimal
7.5%=0.075
.075x=7.38
Divide both sides by .075 to isolate x
x=98.4
The answer is C
Please mark as a brainliest above my comment
A. They need to be sure you will be able to pay the loan back