What is the perimeter of a triangle with side lengths of 9, 12, and 4x? 1. 25 2. 25 + x 3. 21x or 4. 21 +4x
the answer is 21 + 4x. You find this answer by adding up all the sides. 9+12+4x= 21+4x ... you don't add 4x because it has a variable that we do not know of the value.