exam Maths Puzzle Numerical Ability

Given that the quation of a circle is x^2 + y^2 - 10x +4y + 13 = 0, find its center and its radius Cansomeone please show me how to do this??

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exam Other Question

g(x)=6x+12
f(x)=2X+3

Question: 1. Find the (f o g) (x)+X^2
2. Set the answers to part 1 equal to 0 and solve by factoring

HELP!!!!!!! I DON"T UNDERSTAND If the ratio of fast readers to slow readers is 9 to 5, and there 4,716 fast readers, how many slow readers are there? ( show your work )