I need help please!!

Acable car begins its trip by moving up a hill. as it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet. then, as the car moves down to the hill’s base, its elevation drops at the same rate.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2