An equivalent expression to

4/3 (-3 + 1^0)
is
4/3 (-2 + _)

What is the missing number?

The missing number is 1.

To see this, let's simplify the expression step by step:

4/3 (-3 + 1^0)

First, we evaluate 1^0, which equals 1:

4/3 (-3 + 1)

Then, we simplify the expression inside the parentheses:

4/3 (-2)

Therefore, the equivalent expression is 4/3 (-2 + 1).