To solve the expression \( 6.9 - 2^0 \), we first need to evaluate \( 2^0 \).
We know that any non-zero number raised to the power of 0 is 1. Therefore:
\[ 2^0 = 1 \]
Now we can substitute this back into the original expression:
\[ 6.9 - 2^0 = 6.9 - 1 \]
Now, performing the subtraction:
\[ 6.9 - 1 = 5.9 \]
So, the value of \( 6.9 - 2^0 \) is \( 5.9 \).
The answer is 5.9.