Can you please help i will give brainiest and a 5 star rating

Answer:
perimeter: 14x - 3
Explanation:
perimeter = total length measure of all sides.
Perimeter for this triangle:
5x - 7 + 7x + 3 + 2x + 1
5x + 7x + 2x - 7 + 3 + 1
14x - 3
Answer:
14x-3
Step-by-step explanation:
2x+1+7x+3+5x-7
=2x+7x+5x+1+3-7
=14x-3
Hope this helps