Question

Nicholas used a $10 bill to pay for a granola bar that only costs p dollars. How much change did Nicholas receive from the cashier?

Answer 1

you can subtract 10 dollars by the p then you will get your answer 10-p=10p since you can't subtract a number by a letter.

Answer 2

10 - p.
Nicholas would have spent $p, so he has $p less than $10!