Answer:
$6 an hour.
Step-by-step explanation:
$81 divided by 13.5 hours. (to find the rate of dollars per hour)
81 ÷ 13.5 = 6
I am gonna go C I am not completely sure but it is most likely to be the right one
-1 cause 13- 12= negative 1
Answer:

Step-by-step explanation:
From the question we are told that:
Velocity 
The height h function

Generally time t is mathematically given by




Therefore the ball's maximum height is given as



T = -π/4
sin(-π/4) = -sin(π/4) = -1/√2
cos(-π/4) = cos(π/4) = 1/√2
tan(-π/4) = -1