A model rocket is shot into the air off a building and its path is approximated by H(t) = -5(t + 2)(t - 6), where H is the height of the rocket above the ground in metres
and t is the elapsed time in seconds.
a. What is the height of the building?
b. When will the rocket hit the ground?
c. What is the maximum height of the rocket?
I
d. What is the height of the rocket at 3 seconds?
I

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

536

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

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