I am not sure about the last two phrases, but here's what I think.
2(n+18)
18(2+n)
Answer:
x = 
Step-by-step explanation:
Given
+
= 5 ← combine terms on left side
= 5 ( multiply both sides by x )
8 = 5x ( divide both sides by 5 )
= x
Answer:
5x + 13
Step-by-step explanation:
(3x + 9 ) + (2x + 4)
It's quite simple, we just have to add the parts that have x to each other and those that don't have x to each other
3x + 2x + 9 +4 =
then the result is
5x + 13
Answer:C
Step-by-step explanation:
81^½÷3^-1=√81÷(1/3)
=9÷3=3