To find the perimeter of Elliot's sandbox, we need to add up the lengths of all three sides of the triangle.
Let's call the lengths of the sides a, b, and c. We can see from the model that side a has a length of 5 meters, side b has a length of 7 meters, and side c has a length of 8 meters.
Therefore, the expression that represents the perimeter of Elliot's sandbox is a + b + c = 5 + 7 + 8 = 20.
So the perimeter of Elliot's sandbox is 20 meters.
Elliot is building a sandbox in the shape of a triangle. A model of the sandbox is shown. Which expression represents the perimeter of Elliot's sandbox
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