What is the measure, in degrees, of the missing angle in the triangle below? (Angle Q is 39 degrees, angle R is 66 degrees, and angle S is unknown.)

X+ y = 5 ; x - y =3 solve using linear combination

Which of the following is the result of expanding the series

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