Answer:
11.10 or 11.1 :)
Explanation:
a² + b² = c²
6.5² + 9² = c²
42.25 + 81 = c²
42.25 + 81 = 123.25
123.25 = c²
√123.25 = c
√123.25 = 11.10 rounded :)
c= 11.10, if rounding to one decimal place, then 11.1 :)
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