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what is ext{LU} decomposition

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Area and perimeter: word problems

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Q. what is ext{LU} decomposition

Identify Formula: Identify the formula for the perimeter of a square, which is $P = 4s$ , where $P$ is the perimeter and $s$ is the length of one side.
Plug in Value: Given that the perimeter $P$ is $20$ centimeters, plug this value into the formula: $20 = 4s$ .
Solve for s: Solve for s by dividing both sides of the equation by $4$ : $s = \frac{20}{4}$ .
Calculate $s$ Value: Calculate the value of $s$ : $s = 5$ centimeters.

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