exam Maths Puzzle Numerical Ability

Please help me. I really need the answer.
The length of the longer side of a rectangle is 7 more feet than the length of the shorter side. Find the length of the shorter side that will generate an area of at least 18 ft.

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exam Other Question

One leg of a right triangle is 2 inches smaller than the hypotenuse. The other leg is 5 inches long. What are the lengths of the unknown leg and hypotenuse?

Not sure if I set it up right.

(x+2)^2 + 5^2 = x^2 Use the quadratic formula to solve the equation.

2x^2+ 12x =-5