A creature on the moon throws a rock off a cliff. The height of the rock above the surface of the moon, in meters, t seconds after it is thrown is given by h(t) = −t 2 + 8t + 10. When does the rock hit the surface of the moon?

9.099 seconds

Step-by-step explanation:

The rock hits the surface of the moon when is t is 0.

Use the quadratic formula

t = -1.099 and 9.099

Since time can't be negative, the answer is t = 9.099

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb