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)?
a
All real numbers
b
0 ≤ x ≤ 11
c
0 ≤ x ≤ 3
d
x ≥ 0
