The angles of elevation from a point on ground level to the top of a 50-ft tree is 25°. how much closer to the tree does a point on the ground need to be for the measure of the angle of elevation to be twice the measure of the original angle? round to the nearest tenth.

a. 65.3
b. 77.8
c. 41.6
d. 107.2

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)