A rock is dropped from a hot air balloon at the height of 200 meters. The rock height from the ground in meter, h(t) is approximated by the formula h(t) = -5t^2 + 200 where is the time in seconds. What is the average rate of change in m/s of the height of the rock between 2 and 5 seconds

Idon't see any graph, however the graph of the function : f(x) = x²-2x+3 is a parabola: 1) open upward (since a> 0)2) it intersects y-axis in 3 (y=3)3) its axis of symmetry is x = +1 ( -b/2a)4) it's minimum is y = -2, so its vertex is (1,-2)5) it doesn't intersect the x-axis since discriminant < 0