Iwant to make sure that my work is correct so if possible can someone look at it and tell me if i got the table part correct?

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

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

If the discriminant if a quadratic equation is 4 which statement describes the roots?