Answer:
[tex] \frac{4}{ \sqrt{a} } [/tex]
Step-by-step explanation:
The 4th choice is the odd one out because it is the only non-monomial among the group. This choice is the only one with a denominator containing a variable.
Because of this, if we were to equate all the choices into y, and change a into x, only the fourth choice will not have the set of real numbers as its domain.
Hope this helps!
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