book Maths Puzzle Numerical Ability

need an equation
the perimeter of a square equals four times a side
I am new at this!!!!

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book Other Question

The population P of a certain culture is expected to be given by a
model rt e P=100e^rt where r is a constant to be determined and t is a
number of days since the original popula A rectangular room has an area of 170.5 square feet and a perimeter of 53 feet. What are its dimensions?