Does each equation demonstrate the Distributive Property? Explain.
a. -2(x + 1) = -2x - 2
b. (s - 4)8 = 8(s - 4)
c. 5n - 45 = 5(n-9)
d. 8 + (t + 6) = (8 + t) + 6

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.