Help me plz, I have to hand it in this morning

When the ball has traveled a distance of

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

Find the value of x. give reasons to justify your solutions! l, m ∈ kn