A. the bottle rocket reached a maximum height of 56.25 feet.
b. the bottle rocket has reached its maximum height after 15 seconds
c. the axis of symmetry of the graph is x=7.5
d. the equation that is represented by the graph would have one solution
e. the graph has a relative maximum at (7.5,56.25)

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

what does x eaqual

step-by-step explanation: