Step 1: Group this into two groups:
When you do that, be sure to group the "–" into the group with the 9 and make sure there's "+" between the groups.
Step 2: Factor out the GCF from both individual groups:
Step 3: Notice both groups have that (h+2)? That's a new GCF between the two groups, so factor that out:
Step 4: That 
piece can be factored further, since it's a difference of squares:
Now it's factored.
Answer:
I got 1,800 hope this helps
Well we know 4% is just 4/100.
So 20 = 4/100.
Let's find out what 1/100 is and multiply that by 100:
20/4 = 5.
So 1/100 = 5.
5*100 = 500.
Use this formula: C=2πr. Divide 14/2 to get the radius. Substitute the radius into the formula.
The answer is 14pi units.
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