For expression 1, both numbers can convert to terminating decimals which means the sum is a terminating decimal. It is rational.
For expression 2, because the root of 2 is irrational, the sum is also irrational.
For expression 3, root of 5 times root of 5 equals 5 which is rational.
The last expression is rational because 3 is rational and the root of 49 is just 7 which is rational.
answer: A
