a new bridge structure requires triangles that are in a ratio of 1: 1. if ac = 4x − 3 and ec = 2x + 6, find the distance between the top and bottom of the bridge, in feet.

4.5 ft
15 ft
18 ft
30 ft

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)