exam Maths Puzzle Numerical Ability

Can someone please help me!! It would be greatly appreciated:
Find the center, vertices and foci of the hyperbola: y^2=x^2+8x

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exam Other Question

-(E+7)-5E+6 Find the present value of an annuity with payments of $40 a quarter for 10 years, if interest rates are 12% compounded quarterly.


a. $983.64
b. $990.49
c.