Question

Please help me

Answer 1

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?

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

Answer 2

Take the derivative and set it equal to zero and solve from the max

f'x = -32x +160 =0

x = 5

Then to solve from the time for when the ball hits the ground just solve the equation at 0

x(-16x +160) = 0, 10

Hope this helps :)

Answer 3

I'm really confused. I'm sorry. :(