Answer
a) 8 b) 5 c) 1/6 d) 9/11
Work Step by Step
The simplest way to find the simplified version of a radical expression, is to search for square numbers. You will notice that when solving for a, the number underneath the radical is 64, which is a square number ($8^2$). Therefore the simplified version is 8. Moving on, 25 is also a square number ($5^2$), so the square root of that is 5. You will also notice that when you square 1/6, you end up with 1/36, so the square root of 1/36, is 1/6. For the last one, you follow the steps listed above. You will notice that $(9/11)^2$= 81/121. Therefore the square root of 81/121 = 9/11.
