What are the finance charges?

$3.79

$4.68

$5.32

$7.50

Can any one me with the answers to these questions asap?

What is coefficient of the term of degree of degree 5 in the polynomial below

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax