Bob is taking his son to look at colleges. the first college they plan to visit is 150 miles from their home. in the first hour they drive at a rate of 60 mph. if they want to reach their destination in 2.5 hours, what speed must they average for the remainder of their trip? (i wouldn't mind if you use a proportion since that's how i'm supposed to solve 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)