An air traffic controller is monitoring the altitudes of four planes. The four equations below show y, the distance in feet of each plane above the ground, after t minutes of descent. PlaneA: y=-400t+12,000 PLANE B: y =-800t+28,000 Plane C: y= -200t+ 13,500 PlaneD: y= -500t+30,000

Will mark brainliest. when ∆rst is translated 4 units down, what are the apparent coordinates of t’?

Evaluate the expression. (9 + 5)(3 + 2)0

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)