we are given with the inequality

Open the parenthesis we get on left side we get

If you mean z to the powers given the answer will be B
You can find the area of a hemisphere by using the following equation
V = (2/3) (pi)*r^3
so V = (2/3) (pi)*1.6^3
Which comes out as 8.5786423394 or 8.6
X-7 < -3
Remember that the less than or equal to has a line underneath it!
the equation is Y=-2/3x+2/3