exam Maths Puzzle Numerical Ability

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Find the dimensions of a rectangle "a" with the greatest area whose perimeter is 30 feet.

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exam Other Question

I sent this one before but I forgot the plus 1. I am such a moron. Please help.
Write the equation of the line L satisfying the given geometric conditions.
L has y-intercept (0, -3) and is parallel to the line with equation y=2/3x+1. find x intercepts y=x^2-4x+4