Identify the missing denominator in the addition expression 8/11+1/? .
To find the missing denominator, we need to make sure that the fractions have a common denominator before we can add them.
Since the first fraction has a denominator of 11, and we don't know the denominator of the second fraction, we need to find the least common multiple (LCM) of 11 and the missing denominator.
The LCM of 11 and any number is that number itself if it is divisible by 11, or the product of the numbers otherwise.
In this case, the missing denominator must be a multiple of 11. Therefore, the missing denominator in the addition expression 8/11 + 1/? is 11.