Help pls either or! It’s an emergency! Any help advice will do! Pls don’t send me a link

Answer this question! 30 points and brainliest!

What is the quadric regression equation that fits these data

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