Yes because it can be expressed as a fraction in the form of 28/3
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Yes, 9.3 with the 3 repeated is a rational number. It can be expressed as a fraction, 9 1/3, which means it can be written as a ratio of two integers.
Yes.
No
The square root of 93 is an irrational number
Yes.
No. A rational number can also have repeated decimals, like 1/3 = 0.33333... or 1/7 = 0.142857 142857 142857 ...