Answer:
x = 31, x = 19
Step-by-step explanation:

I believe the answer for 17 is C. 18 I am not sure how to do. For 19, however, the answer is B. Hope I help, and sorry I can't answer 18.
Ok, so we know one point is (4,2) and the other is (-4, 0)
Slope: -2/-8 = 1/4
y ? 1/4x + b
0 = -1 + b
b = 1
y < 1/4x + 1
What is the formula for calculating the volume of a cube?
V = s x s x s where s = the length of a side
V = .5 x.5 x.5 = .125