How do we find compound probability

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

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)