Subtract Using Additive Inverse Practice Test

A football team gains $$12$$ yards, then loses $$18$$ yards, then gains $$7$$ yards. Using additive inverse for each loss, what expression shows their total yardage change?

Sarah's bank account had a balance of $$\42.50$$. She wrote a check for $$\67.25$$. To find her new balance using subtraction as adding the additive inverse, which calculation should she perform?