What does the relative frequency equal?

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

What is the anwers for 9+2x=5x-3-x

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