Y= sin(0+pi/3) what are the five ordered pairs

What does x = in this equation x+3+2x=x+5

It says factor each expression completely 8y+48

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