Im not that good with these types of problems but i think it is b if my math is correct.
Hope this helps with the answer to your question:)
Answer:
R=7
Step-by-step explanation:
R=1+3w
This is a classic substitution question.
Just replace the w with 2.
R = 1+3(2)
You only need to multiply 3 with 2.
R = 1 + 6
R= 7