Which of the following is a radical equation?
ox+ 6 - 12
o x2 - 16
o 3+x7 - 13
07vx = 14

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.