In order to solve this we need to get x by itself on one side.
We need o start by adding across the 4 so that we get:
x/3 = -7 + 4 = -3
We then need to multiply both sides by 3 to get a singular x:
x = -3 * 3 = -9
1. A, it is a function
2. A, it is not a function
(-4)^-3 =
-4^-3 = 
Basically in this situation there is no difference whether parenthesis are used or not.
There are 12 inches in a foot
108/12 = 9
108 inches = 9 feet
Using Pythagoras theorem:-
10^2 = 4^2 + h^2
h^2 = 100 - 16 = 84
h = sqrt 84 = 9.17 ft answer