book Maths Puzzle Numerical Ability

Please help me determine the center and radius of the circle with equation:
x^2+y^2=-4x+6y
Thank you

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book Other Question
A reflecting telescope has a parabolic mirror for which the distance from the vertex to the focus is 35feet. if the distance across the top of the mirror is 54inches, how deep is t Pre-Alegebra. Multiply. Write each product in lowest terms.

7
--- X 15 =
10

I am having a hard time with this one. Could you please answer this problem and explain it to me? I would appreciate it.. Thanks