The expression 12+x+412+x+4 represents the perimeter of a triangle. simplify the expression.

1. 22

2. 1

3. 7

4. 18

step-by-step explanation

e2020 got it right

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.