Write an algebraic expression for the following word phrase. 13.42 less than the product of 26 and x

Ifurniture stores having a weekend sale and is offering 20% discount on patio chairs and table the sales tax on furniture is 6.25 using function composition how can you represent the total amount a that you would need to pay for this furniture that cost x dollars

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

Can someone show me step by step how to do this?