book Maths Puzzle Numerical Ability

A rectangular room has an area of 170.5 square feet and a perimeter of 53 feet. What are its dimensions?

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book Other Question

need an equation
the perimeter of a square equals four times a side
I am new at this!!!!
looking desperately for the answer to this:

6x to the second power - 12x - 18 = ????

Please help... thank you, krista m pooler