A dolphin jumps from the water with an initial velocity of 44 feet per second at an elevation angle of 60°. Which parametric equations model the dolphin’s path through the air? x(t) = sin(60°)t + 44 and y(t) = –16t2 + cos(60°)t + 44 x(t) = cos(60°)t + 44 and y(t) = –16t2 + sin(60°)t + 44 x(t) = 44sin(60°)t and y(t) = –16t2 + 44cos(60°)t x(t) = 44cos(60°)t and y(t) = –16t2 + 44sin(60°)t Please help quickly!

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)