exam Maths Puzzle Numerical Ability

I need to solve for X. The problem is 2x^2+24=x^2 i then moved the x^2 so that the problem read x^2+24=0 i have to factor it out. I also have to subtract X by five. X is a distance so it cannot be a negative number X must be greater than five.

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The department store has determined that 7% of sales will be retuened. For the next 10 sales determine the following:
1. The expected number of return.
2. The variance.
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