Plz mee

question is in the picture

a. factoring
b. isolating the x^2 term and finding the square root of both sides
c. using the quadratic formula
d. all three methods would be efficient

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