In a circle with a diameter of 25.2 ft. an arc is intercepted by a central angle of 168°. what is the arc length? use 3.14 for pi and round your final answer to the nearest hundredth.
enter your answer as a decimal in the box.

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)