If the sides of a cube are doubled in length what happens to its volume

Lets say the side of the cube is x units in length.

The volume of the cube then is x * x * x = x^3 units cubed

After the sides are doubled, new length of cubes is 2x units

New volume is (2x)^3 = 8(x)^3 units cubed.

The change in volume = 8(x)^3 divide by x^3 to get 8.

So the volume of the cube increases 8 times.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

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