Help! Write and evaluate an expression for the problem.

You buy a hat for $12 and give the cashier a $20 bill. How much change do you receive?

An expression is:

The change received is:$​

The price of a lawn mower is x dollars. the store is having a 75% end of summer clearance sale. which expression can be used to find the clearance price of the mower? a) .25x b) .75x c) x - .25(75) d) x + .25(75)