exam Maths Puzzle Numerical Ability

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.
3. The

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exam Other Question

I have to write in standard form and determine the values of a,b, and c. CAn you please help me?

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Number 6

3x^2 + 10x + 8 = -17x - 2 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.