Question

Between which pair of rational numbers on a number line does  18−−√
lie?(1 point)
Responses

Between 4.3 and 4.5
Between 4.3 and 4.5

Between 9 and 9.2
Between 9 and 9.2

Between 4.2 and 4.3
Between 4.2 and 4.3

Between 8.9 and 9.1
Between 8.9 and 9.1
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1 answer

To find between which pair of rational numbers \( \sqrt{18} \) lies, we can first determine the approximate value of \( \sqrt{18} \).

The value of \( \sqrt{18} \) can be simplified as follows:

\[ \sqrt{18} = \sqrt{9 \times 2} = \sqrt{9} \cdot \sqrt{2} = 3\sqrt{2} \]

Now, since \( \sqrt{2} \) is approximately 1.414, we can find:

\[ 3\sqrt{2} \approx 3 \times 1.414 \approx 4.242 \]

So, \( \sqrt{18} \approx 4.242 \).

Now, we compare this value to the given options:

  • Between 4.3 and 4.5: 4.242 is less than 4.3, so this option is not correct.
  • Between 9 and 9.2: 4.242 is much less than both 9 and 9.2, so this option is not correct.
  • Between 4.2 and 4.3: 4.242 is greater than 4.2 and less than 4.3, so this option is correct.
  • Between 8.9 and 9.1: Again, 4.242 is much less than both 8.9 and 9.1, so this option is not correct.

Thus, the correct answer is:

Between 4.2 and 4.3.

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