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rjkz [21]
3 years ago
15

Is my answer correct !???

Mathematics
1 answer:
puteri [66]3 years ago
5 0
Yes, your answer is correct.
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I need help on this???
Aliun [14]
Use the geometric mean for right triangles here.  Like this \frac{9}{y}= \frac{y}{7}.  Cross multiply to get y^{2}=63, and y= \sqrt{63}.  That simplifies down to y= \sqrt{9*7}.  Pull out the 9 as a perfect square of 3 and you're left with y=3 \sqrt{7}, first choice above.
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