Which problem can be solved using the equation shown? 2 dollars and 50 cents x minus 2 dollars = 10 dollars and 50 cents

Look below.

Step-by-step explanation:

$2.50*-$2.00=10.50

This isn't right so I don't know what you're asking for ...

A

Step-by-step explanation:

Will bought several books that cost $2.50 each and received a $2.00 discount on his total bill. If he paid $10.50, how many books did he buy?

X is the amount he bought and the discount would represent subtracting from 2.5x.