Which is equivalent to 16 3/4x?

-4√16^3x

-4√16^3

-3√16^4x

-3√16^4

The equivalent to 16^ (3/4x) is ⁴ˣ√16³.

It reads, 4x root of 16 raised to the power of 3.

16^ (3/4x) can be written like this: (16 ³) ^1/4x

1/4x as an exponent means the 4x root of the base number.

3 as an exponent simply means that the base number is raised to the third power.