Does anyone know the answer?

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

Evaluate the expression. (9 + 5)(3 + 2)0

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5