book Maths Puzzle Numerical Ability

What are the length and width of a rectangle if the area is 13.5 square feet and the length of one side is .2 the measure of the perimeter?

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book Other Question

V=AR+W For V
AR+W is over 2

I am into this part. I am totally clueless how to manipulate formulas. In general, I c find the exact value of cos 105 degrees WITHOUT USING TABLES OR A CALCULATOR. be sure to show your work.