A jumping spider jumps from a log onto the ground below. Its height, h, in centimetres, as a function of time, t, in seconds, since it jumped can be modelled by the function h(t) = -490t2 + 75t + 12. Where appropriate, answer the following questions to the nearest tenth.
a) Graph the function.
b) What does the h-intercept represent?
c) When does the spider reach its maximum height? What is its maximum height?