Find Perimeter of an Equilateral Triangle

The equilateral triangle has three values. One is (2x-3), another is (x+5), and the last one is (21-x). Could someone explain how to finish this question? The values are odd so I'm just confused.


Why Can Varied Species Live Together in Particular Ecosystems?

Consider the following question: > The Piney Woods of Eastern Texas is home to a wide variety of organisms ranging from the grass Longleaf Oats to coyotes. Which of the following best explains... more

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