The function h(t) = −5t2 + 15t shown in the graph models the supporting structure of a bridge: graph of parabola starting at zero comma zero, rising from the left to about one and one half comma 11, and falling to the right, ending at 3 comma zero What is the domain of h(t)? All real numbers 0 ≤ x ≤ 11 0 ≤ x ≤ 3 x ≥ 0