Complete the square to write 16t² - 96t + 48 = 0

How can you construct perpendicular lines and prove theorems about perpendicular lines

Having a hard time understanding this question (see attachment).

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.