Paola Gould

Mathematics

8 February, 09:22

A toy rocket was launched from the ground. The function f (x) = - 16x2 + 160x shows the height of the rocket f (x), in feet, from the ground at time x seconds.

What is the axis of symmetry of the graph of f (x), and what does it represent?

These are the choices:

x = 10; it takes 10 seconds to reach the maximum height and 10 seconds to fall back to the ground

x = 10; it takes 10 seconds to reach the maximum height and 20 seconds to fall back to the ground

x = 5; it takes 5 seconds to reach the maximum height and 10 seconds to fall back to the ground

x = 5; it takes 5 seconds to reach the maximum height and 5 seconds to fall back to the ground