harlp needed ok thanks dudes

Rational number - Any integer, fraction, terminating decimal, or repeating decimal is classified as a rational number
Irrational number - All the real numbers which are not rational numbers.

Option A - Rational or Irrational?

1/2 + 1/3

Since both are known as fractions, they are rational numbers.

Option B - Rational or Irrational?

√2 + 5/2

√2 is classified as an Irrational number because if it is simplified, it does not result in any integer, fraction, terminating decimal, or repeating decimal.

Option C - Rational or Irrational?

1/√4 + 7/2
=> 1/2 + 7/2
=> 8/2 = 4

Since this is an integer, this is rational.

Option D - Rational or Irrational?

√9 + √4
=> √3 x 3 + √2 x 2
=> 3 + 2 = 5

Since this is an integer, this is rational.

In conclusion...

Option B is correct.