Volume of a cylinder of radius r and heigth h is

Here h is 15 cm and r is 6 cm.
Paying off the entire loan = 12 * 437.26 =
<span>
<span>
<span>
5,247.12
</span>
</span>
</span>
He paid 6 * 437.26 =
<span>
<span>
<span>
2,623.56
</span>
</span>
</span>
He then paid 2,556.03
2,623.56
plus = 2,556.03 =
<span>
<span>
<span>
5,179.59
</span>
</span>
</span>
<span>
<span>
5,247.12
</span>
minus </span><span>5,179.59 =
67.53 the amount of money he saved.
</span>
F(2)=2(3*2)+1
f(2)=2(6)+1
=13
answer is 13