In a race, 16 out of the 25 bicyclists finished in less than 51 minutes. What percent of bicyclists finished the race in less than 51 minutes? Write an equivalent fraction to find the percent.
16x
25 x
100

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)