Which expressions simplify to a rational answer? select each correct answer.

The expression that simplify to a rational answer are:

Remember that to multiply radicals/roots of the same index, we just need to multiply the radicans (the numbers inside the radical/root) and simplify. Let's simplify each of our expressions.

1.

Since 5 is rational, our expression simplifies to a rational answer.

2.

Since is irrational, our expression doesn't simplifies to a rational answer.

3.

Since 12 is rational, our expression simplifies to a rational answer.

4.

Since 21 is rational, our expression simplifies to a rational answer.

idk

step-by-step explanation:

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