The toy rocket hits the ground when h(t) = 0.
So, h(t) = 0 = -9t^2 + 81.
Solving the equation,
-9t^2 = -81
Dividing by -9
t^2 = 9
Taking the square root.
t = 3
The answer is 3 seconds.
When you reflect across the Y axis, the Y value remains the same and the x value becomes opposite.
Answer: (5,-3)
-3 + -3 = 0
-5 + 1 = -4
vector = < 0,-4 >
first
second
and fifth are true
Basically the square root of -1 is i. From that you should be able to deduce the answers.
