book Maths Puzzle Numerical Ability

I need help finding the radius and center of a circle with the following equation x squared+ y squared + 4x + 10y + 15 = 0 thanks!

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book Other Question

In how many ways can you walk up a stairway that has 7 steps if you can take 1 0r 2 steps at a time? Simplify: -3√[121]+(-1)^3