What is 15 plus 15 plus 12 plus 13 plus 10

(hurry! ) which expression is equivalent to the following complex fraction?

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

Abcd is a square. what is the measure of angle bac