exam Maths Puzzle Numerical Ability

Evaluate is possible:

sgrt -121

Is this an equation that can be evaluated?

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exam Other Question

i do not even know where to begin on this problem The profit function for a business is given by the equation P(x)=-4x^2+16x-7, where x is the number sold, in thousands, and P(x) is dollars in thousands. Find the maximum profit and how many items must be sold to achieve it.