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

Find the value of Arc sin (cos pi/4). a publisher printed 56 million pages in its production last year. If this represents a 112% over the number of pages printed the previous year, how many pages were printed the previous year?