Answer: the answer is 2x-1

I believe but I am not too sure.
Answer:
1
Step-by-step explanation:
If there is nothing by the (x) in the equation there is always an invisible 1 next to it. The full equation is f(x)= 1x+3. The answer is 1. Hope that helps!
Answer:
Yes, to add a positive number you ALWAYS move right on the number line.
Answer:
Width = 9
Step-by-step explanation:
(P=2L+2W) = 72
L = 3W<- length is triple the width
(P = 2(3W) + 2W) = 72
P = 8W =72
W = 9