dont want to go to summer school would be so thankful to anyone who could help me with this math problem

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

(60 points) explain this in detail

Which of the following expressions cannot be simplified to x – 2?