Hi, I had a two part question:

We just learned improper integrals today and I am finding the concept a little tricky. (Quite frankly, I suck at limits in general).

However, I am stuck as to when we are finding thevolume

Would the volume not be $\displaystyle \frac{\ln(0.7x+1.7)}{0.7}$ from 0 to infinity?

And when I tried doing:

$\displaystyle \frac{\ln(0.7\infty+1.7)}{0.7} - \frac{\ln(0.7(0)+1.7)}{0.7}$

you would get infinity minus whatever number on the right?

I am so confused. I cannot find a good example online, in my books or in my notes.