exam Maths Puzzle Numerical Ability

A picture 11 inches by 15 inches is to be mounted on a piece of matboard so that there is an even amount of mat all around the picture. How wide will the border be if the area of the mounted picture is 285 square inches?

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exam Other Question

Show that e^(z) has NO zeros.

I know z = x + iy, so e^(x+iy) = e^(x)*e(iy).
I'm not sure where to go from here if I set this last equn to zero.

I also need help finding the A crystal in the shape of a cube is growing in a laboratory. Estimate the rate at which the surface area is changing with respect to the side length when the side length of the cry