How do you solve a one-step equation involving +,-, 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

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

Use circumcenter theorem to solve for the given values