Solve the following problems: 1. 3^x = 81 2. sqrt(64) 3. sqrt((16)/(25)) 4. Show 5346 is divisible by 9 without dividing.

The value of x is $\boxed{4}$.

4. Find the square root of 64.

The square root of 64 is $\boxed{8}$.

5. Find the square root of $\frac{16}{25}$.

$\sqrt{\frac{a}{b}} = \frac{\sqrt{a}}{\sqrt{b}}$.

The square root is $\boxed{\frac{4}{5}}$.

6. Without dividing, show that 5346 is divisible by 9.

A number is divisible by 9 if the sum of its digits is divisible by 9.

Since 18 is divisible by 9, the number 5346 is also divisible by 9.
Therefore, $\boxed{\text{5346 is divisible by 9}}$.