Tough to answer this because you haven't indicated what to do with the 81.
64r2 - 144 factors to 16(2r + 3)(2r - 3)
64r2 - 81 factors to (8r + 9)(8r - 9)
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Since 81 is not divisible by 7 therefore, 7 is not a factor of 81.
No, 18 is not a factor of 81.
Nine is the highest common factor of 81 and 9
The GCF of 53 and 81 is 1.
The greatest common factor of 56 and 81 is 1.