A) Yes. This argument uses the Law of Detachment.
It is given that the third terms is obtained by multiplying the second term by 2 and then adding 3:

Since the third term is 17, we have

And then again, the second term is obtained by multiplying the first one by 2 and then adding three:

Solve this equation for
and you'll get the answer
Answer:https://www.wolframalpha.com/pro/step-by-step-math-solver?src=widget
Step-by-step explanation: hope this helps
When I plug in those numbers I got:
28.28427124
Hope This Helps!!
:)
<em>Because OP only asked for a clarification of the problem statement: </em>
You are asked to find the green area. (Hint: divide the green area into rectangles and right triangles, because you know their area.)