exam Maths Puzzle Numerical Ability

I= E/R+r for rfor r.

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The radius of the base of a cylinder is 2.7 mm. The height is 2.7 mm. Find the surface area. Round to the nearest hundreth. I need help solving this word problem,

The distance r to a star is measured in parsecs, but astronomers like to use the Distance Modulus M given by the formula M= 5log r-5. If a star is 52 parsecs away, what is its distance modulus?