Suppose f point c e (a, b) such that f (c) 0. is a differentiable function on la, b) and suppose f'(a) > 0> f (b). then there is a

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.