A plant that floats on the surface of rural bodies of water is known as duckweed. The initial mass of a population of duckweed is 500 kg. The mass of the population triples every 45 hours and can be represented by the function M(t)= 500• 3 t/45, where t is time in hours
Determine how many hours it would take for the duckweed to grow to a mass triple the original size

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)