WILL MARK BRAINLIEST! PLEASE HELP!!

An octagon has 8 sides. Each side is given as 2a + 1
Perimeter = 8(2a + 1)
= 16a + 8
Answer: 16a + 8
as we all know ... an octagon has 8 corners / sides
and they told that each side is equal to 2a + 1
so we need to make an equation which will be 8 (2a+1)
ans now we need to multiply 8 with both 2a and 1
so, 8 ( 2a + 1 )
16a + 8
we cant do this further as its not "like"
so the answer is 16a + 8