Hello !
You have to do as follow :

Distribute the parentheses:
2(x + 1)
2 · x = 2x
2 · 1 = 2
2(x + 1) = 2x + 2
Answer:
cos X = 
Step-by-step explanation:
simplify 15/39
Answer:
diameter is 16.60 ft
the circumference is 52.12ft
Step-by-step explanation:
Hope this helps!