Question 743463
The problem states:

For all x > 0 and y > 0, what is this radical expression Sqrt(x) / 3 sqrt(x) - Sqrt(y) equivalent to?

we can rewrite with exponents,

x^1/2 / 3x^1/2 - y^1/2

x^1/2 can be canceled from the numerator and denominator,

1/3 - y^1/2