If I counted correctly, the answer would be 52/150. You just need to simplify the fraction. I'll recount soon, and update if it changes.
Answer:

Step-by-step explanation:
Product of of 3 and b is 3b
At least means greater than or equal too.

Kelsey must spend less than or equal to $65.
The expression 5.50b+7.5 is correct
Kelsey able to purchase 10 books.
On the end Kelsey can spend $2.50 to purchase small present (calendar or book for notes)
Fifthteen(15)xseventy (70)= 1,050
Are a and b two points on a line
If they are you can use the distance formula