### Home > CALC > Chapter 9 > Lesson 9.4.1 > Problem9-108

9-108.

The region under $y = \sqrt { x - 1 }$ on the interval $1 ≤ x ≤ a$ for some $a > 1$ is rotated about the line $y = −1$. If the volume of the resulting solid is $10π$ cubic units, what is the value of $a$?

$a ≈$