Answer:
Both statements are true.
Explanation:
(a) The general equation for tripling time of a population is
, where n0 is the initial population size, t is the time, and a is the doubling time. Since the first part states that n0 = 40 and a = 11, the equation is accurate
(b) We use the first equation and plug in 4 for t and check to see if it's accurate:

The population is indeed approximately 60 after 4 hours.