exam Maths Puzzle Numerical Ability

How long will it take for an investment of $750 to double at 7% compounded annually?

How do you set this problem up and do it?

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exam Other Question

The polynomial -4.9t^2+40t+20 represents the distance above the ground of an object thrown straigt up an initial height of 20 meters and with an initial speed of 40 meters per seco All possible solution to the equation 2x^3-4x^2+5x-14=0 is ....?