exam Maths Puzzle Numerical Ability

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.

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exam Other Question

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 find the coefficients a,b,c.

log(7,(8x^6/y^4)) = a log(7,2) + b log(7,x) + c log(7,y).

I do not understand the form they are seeking.

I have come up with 6log(7,8)+log(7,