Answer:
1. 6x+15
2. x=5
Explanation:
Since the triangle has sides that are the same, we know that 15 is one side and since 15/3 = 5 so x=5. Also for perimeter you add all the sides so 3x+3x+15 and add like terms so you get 6x+15.
21 is the value of x (you add the sides up)
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