Find the discount if the original price is $8.05 and the percent markdown is 10 % round to the nearest cent

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?

Need plz been trying to do it for a long time and still haven’t succeeded