book Maths Puzzle Numerical Ability

How do you simplify this fraction? 15c-5c squared over 3c-c squared.

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book Other Question

f(x)= log x

I dont even know how to begin. If the Richter magnitude formula is R=0.671 Log(0.37E)+1.46. R= Magnitude and E= the energy in kilowatt-hours. What is the magnitude of 5.02x10^8 kwh of energy?