Can someone me it's worth five points

What is the value of the expression below? 148+(-6)| + |– 35= 7|

For what value of (y) is 3^3/3^y =1/9

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