Mia is not correct. The statement that any time there is a radical in an addition expression, it automatically has an irrational number as the sum is false.
The correct response is: No, some radicals simplify to rational numbers.
For example, the square root of 4 is 2 (a rational number), and if you add it to 5, the sum is 7 (also rational). Therefore, not all addition expressions involving radicals yield irrational sums.