exam Maths Puzzle Numerical Ability

i have to write the circle in standard form. then give the center and radius of the circle. x^2+y^2+8x-2y-8=0

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exam Other Question

From the top of an office building 72 ft high, the angle of elevation to the apartment building across the street is 31o. From the base of the office building, the elevation is 46o. How tall is the apartment building. Mary wants her $9000 GIC to double in value in nine years. What annual rate of interest is required for her to reach her goal. Assume interest is compounded annually.