Please help me, I have no clue what its asking and I have to explain it in class tomorrow morning its kinda blurry so;

The measurements for each side of the triangle:

side 1 (the vertical side): x-4

side 2 (the horizontal side on the top): x-1

side 3 (horizontal side on the bottom): 1/4x + 5

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The term was obtained by grouping and adding the all x terms in the expression.

Step-by-step explanation:

The example has already provided this step:

(x -4) +(x +1) +(¼x +5)=

Thus, the question is asking how is derived from the expression.

The attached picture shows the intermediate working to arrive at the final perimeter expression.

This expression is later equated to 20 since it is given that the perimeter of the traingle is 20 inches.

just needed some points but try socratic