3x+21 is a simplified version of this algebraic expression
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The diameter of the outer ring will be 4 inches since it extends one inch beyond the bull's eye from either side. See the attached image for clarification.
The area of the outer ring can be expressed as:

This is because we need to take into account of the space taken up by the bullseye.
Now we set up our equation:

Now plug and solve:


Answer:
45
Step-by-step explanation:
let the longer tape be x
shorter tape be y
given
x+y=135⇒equation 1
also given
2y=x⇒equation 2
subtituting eq2 in eq1
2y+y=135
3y=135
y=135/3=45
hope this helps
I think it is the first option. hope this helps :)