exam Maths Puzzle Numerical Ability

graph the function.
f(x) = -2x -5

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exam Other Question

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. (Can someone Suppose N=x^+2 models the number ofcases of infection, in millions, of a disease x years from now. Approximately how many years will there be 7 million cases.

I got this 7=x^+2
(-x^2)=(-5)
x=25