Arianna has $0.90 worth of nickels and dimes. She has 4 times as many nickels as dimes. By following the steps below, determine the number of nickels, x, and the
number of dimes, y, that Arianna has.

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.