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A. The expression for the total perimeter of the pool is 12x² + 15.

Expression for the total perimeter of the pool

The expression for the total perimeter of the pool is calculated as follows;

P = 3L

where;

  • P is perimeter of triangle
  • L is length of a side of the triangle

From the given options;

A. 12x² + 15

B. 20x² + 25

C. 12x² + 8x + 25

D. 24x² + 16x + 50

From option A, 3 is a common multiplier of 12 and 15

Perimeter = 3L = 3(4x² + 5)

Learn more about perimeter here: https://brainly.com/question/19819849

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