exam Maths Puzzle Numerical Ability

could you please help me solve step by step : 4(k+2)-8k-5=-3k+9-2(k+6)

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exam Other Question

How long would it take to drive 9 miles and 45mph PRofit: the yearly profit P for a widget producer is a function of the number n of widgets sold.The formula is P= -180 + 100n -4n^2.
Here P is measured in thousands of dollars, n