exam Maths Puzzle Numerical Ability

Why do we call the equation "ax^2+bx+c=0" as quadratic equation?

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exam Other Question

If your car gets 21.6 miles per gallon, how many gallons of gas do you need to travel 324 miles? The bridal shop has net sales of $33,000 and returns of 1/12 of gross sales. If net sales equal gross sales minus returns, find gross sales.