Help me I don’t know to do this

the correct number line is the third one (the oe you already marked as the correct answer).
First, let's try to estimate the square root of 24.
We know that 5*5 = 25
Which means that √25 = 5, then √24 ≈ 5
Also note that 4*4 = 16, then √16 = 4
Clearly, we can see that √24 will be closer to 5 than to 4, then:
√24 > 4.256
This means that the square root of 24 should be at the right of 4.256.
Now, getting the exact value:
√24 = 4.9
Then we conclude that the correct number line is the third one (the oe you already marked as the correct answer).
If you want to learn more about square roots:
https://brainly.com/question/98314
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