Hi, I've been asked to model the motion of a car, t = seconds (from 0 to 10) and y = meters (0 to 100). For the first 10 seconds the motion can be described as y=100-1.5t^2. When plotted I get a negative parabola, the vertex at y=-50. When plotting the nDeriv I also get a negative result. Is this right or am I entering the function incorrectly?