A boat is heading towards a lighthouse, where Camila is watching from a vertical distance of 107 feet above the water. Camila measures an angle of depression to the
boat at point A to be 20°. At some later time, Camila takes another measurement
and finds the angle of depression to the boat (now at point B) to be 31°. Find the
distance from point A to point B. Round your answer to the nearest foot if
necessary.

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)