Shelly biked 21 miles in 4 hours. what is shellys average speed in miles per hour? at the same rate how many hours will it take shelly to bike 42 miles?

Which function can be used to model the monthly profit for x trinkets produced? f(x) = –4(x – 50)(x – 250) f(x) = (x – 50)(x – 250) f(x) = 28(x + 50)(x + 250) f(x) = (x + 50)(x + 250)