After a special medicine is introduced into a petri dish full of bacteria, the number of bacteria remaining in the dish decreases rapidly. The relationship between the elapsed time t, in seconds, and the number of bacteria, B second ( t ), in the petri dish is modeled by the following function: Bsecond(t)=6000⋅(15/16)t Complete the following sentence about the rate of change in the number of bacteria in minutes. Round your answer to two decimal places.
Every minute, the number of bacteria decays by a factor of ___.

Plz heeeeeeelp plz give me the answer

This is different from the first one can someone me

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)