I don’t understand this pls help

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

Graph the equationy= x+3[tex]y = x + 3[/tex]

Ron has 8 caps and 4 of his caps are blue. thes rest of his cap are red. how many of ron's caps are red