In the order of PEMDAS
the first thing you would do is divide 18/3 = 6
then multiply 6 x 4 = 24
then add 24 + 6 = 30
I think it is 2pi but don't take my word for it :)
Which question are you asking about?
Answer:
The perimeter is 
Step-by-step explanation:
The perimeter of a triangle is the distance around its edges.
The given triangle has side lengths 5x + 3, 5x – 5, and 3x – 2.
The perimeter is : 
Group similar terms to get:

Combine the similar terms to get: 
Hence the perimeter in terms of x is 