Derek is riding his bike 10 mph. he takes 20 seconds to reach 15 mph. what is his acceleration?

His acceleration would be 4 mph squared because you have to divide 20 by the change in speed which is 5, so therefore 20/5 is equal to 4

29. because you will divide each number of months by 12 to find the number of years. which would mean, 5, 12.5, 16, 45, 50, 72.5. which is crazy. anyhow, i think you find the median in the middle. and yea hope your test goes good