Answer:
2 packs
Step-by-step explanation:
Since there is 10 packs just divided it by how many notebooks were in the pack.
Give me a min I’m solving hmmm if you round it to the nearest cent you get
The area of a shape is the amount of space it can occupy.
<em>The value of r is 13</em>
From the question (see attachment), we have:
--- area of the shaded region
--- the width of the shaded region
The area of the complete circle would be:

The area of the small circle is:

So, the area of the shaded region is:

Substitute known values

Substitute 2 for w

Expand

Open brackets

Cancel out line terms

Divide through by 4

Factor out pi

Divide through by pi

Substitute 22/7 for pi

Using a calculator, we have

Solve for r


Hence, the value of r is 13
Read more about areas of circles at:
brainly.com/question/23328170