a. $150
b. 150+20x
630
20x
480
x
24
c. 150+20x
750
20x
600
x
30
d. 150+20x
950
20x
800
x
40
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So to solve for y, we need to get y alone on one side of the equation. So we are going to subtract 9x from both sides of the equation to get:

And since y is negative, we are going to divide both sides by -1 in order to make the y positive:

Suppose the length of each side of the cube is x, so the volume must be:
x^3.
If the volume is 15 cm^3, so the length must be cuberoot(15) which is not integer,. So, the volume of the cube with integer side never equal with 15 cm^3
Answer:
482.8 cm
Step-by-step explanation:
A=2(1+sqrt2)a^2=2·(1+squrt2)·10^2=482.84271