If using the method of completing the square to solve the quadratic equation x^2 - 20x + 33 = 0, which number would have to be added to "complete the
square"?

Negative 5 1/12 + negative 4 1/4 + 6 3/4

Mason and christian go to the movie theater and purchase refreshments for their friends. mason spends a total of $45.75 on 3 bags of popcorn and 6 drinks. christian spends a total of $71.50 on 6 bags of popcorn and 4 drinks. write a system of equations that can be used to find the price of one bag of popcorn and the price of one drink. using these equations, determine and state the price of a drink, to the nearest cent.

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me