exam Maths Puzzle Numerical Ability

I have an assignment for school that says "give a real life example of a quadratic formula application". How do I find this?

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exam Other Question

2x+3y=1
-3x+4y=-10
If the perimeter of a rectangle is 20 ft and the width is 6ft, find its length.[hint the perimeter of a rectangle is given by P=2L+2W.]