exam Maths Puzzle Numerical Ability

ok i have to solve this equation.

S=2WL+2LH+2WH (solve for L)

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exam Other Question

An isoscelenes trapezoid has one base 23 inches long, and a height of 8 inches. If the area of the trapezoid is 136 square inches, what is its perimeter? What is the answer in standard form and the center and radius of this circle equation?
3x^2+3y^2-18x+6y=18