Arunner wants to be able to run 400 meters in 50 seconds. what miles-per-hour speed must the runner attain to accomplish this goal? the runner knows that there are 1609 meters in a mile. (round to the nearest whole number)

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

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.