Identify all irrational numbers from -6, the square root of 4 negative negative 3 over 4

This is an integer. It can be written as $\frac{-6}{1}$. Since it can be expressed as a fraction of two integers, it is a rational number.

This is $\sqrt{4}$.

This is an integer. It can be written as $\frac{2}{1}$. Since it can be expressed as a fraction of two integers, it is a rational number.

This can be written as $-\left(-\frac{3}{4}\right)$.

This is already in the form of a fraction of two integers. Therefore, it is a rational number.

All the numbers provided are rational.

The irrational numbers from the list are: $\text{None}$