Dont really know how this works but some one out there please help mw out

Although this question may seem daunting, factoring the denominators will make them so much easier.

We have two denominators:
b^2 + 2b + 1 and b^2 + 7b + 6

Factor both equations:
(b + 1)(b + 1) and (b + 1)(b + 6)

As you can tell, in order to find the LCD we have to multiply the denominator on the left by (b + 6) and the denominator on the right by (b + 1)

The LCD is (b + 1)(b + 1)(b + 6), or b^3 + 8b^2 + 13b + 6

If you need me to explain anything I did here, just ask :)
-T.B.

If i'm correct the answer is $15.97

4should be the last one n=4