Please help ?

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

Evaluate the expression. (9 + 5)(3 + 2)0

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length