What is y to the 3rd power plus 2x minus 7 to the power of y? ( will earn 15 points if answer this, sorry didn't have enough but will want to give you more if i had more: ()

Can someone me and do the problem plz so i can understand it more better

Which expression is equivalent to 3^3 + 2^2?

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. after tax the total is 45.99. what percentage of the subtotal is the total?