Which is the better deal? 1 pizza for $5.00 2 pizzas for $10.00 3 pizzas for $12.00 5 pizzas for $19.00

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