Considering the circumference of the circle, we have that:
8 - a. The solution for r is: [tex]r = \frac{C}{2\pi}[/tex]
8 - b. The radius is of 7.5/pi.
What is the circumference of a circle?
The circumference of a circle of radius r is given by:
[tex]C = 2\pi r[/tex]
For item 8, the solution for r is:
[tex]r = \frac{C}{2\pi}[/tex]
For a circumference of 15 inches, we have that C = 15, hence the radius is found as follows:
[tex]r = \frac{15}{2\pi} = \frac{7.5}{\pi}[/tex]
Hence for item 9 the radius is of 7.5/pi.
More can be learned about the circumference of a circle at https://brainly.com/question/20489969
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