6. a) Write an expression in simplest form for the perimeter of the triangle below.
b) Find the perimeter if the value of $x$ is 3 .

Answer

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Answer

The final answer is: $ \boxed{21} $

Steps

Step 1 ：Write the expression for the perimeter: P = a + b + c

Step 2 ：Substitute x = 3 and calculate the perimeter: P = 7 + 7 + 7 = 21

Step 3 ：The final answer is: $ \boxed{21} $