To solve the inequality \( \sqrt{2n} < 5 \), we first isolate \( n \):
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Square both sides to eliminate the square root: \[ 2n < 25 \]
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Divide both sides by 2: \[ n < 12.5 \]
Now we can check the values provided:
- \( n = 8 \): \( 8 < 12.5 \) (True)
- \( n = 16 \): \( 16 < 12.5 \) (False)
- \( n = 12.5 \): \( 12.5 < 12.5 \) (False)
- \( n = 18 \): \( 18 < 12.5 \) (False)
The only value for \( n \) that makes the inequality \( \sqrt{2n} < 5 \) true is 8.