book Maths Puzzle Numerical Ability

If the two-digit integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the sum of M and N ?
(A) 181
(B) 163
(C) 121
(D) 99
(E) 44

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book Other Question
solve for b

y=mx+b Express as a single logarithm and, if possible simplify
log(x^3-8)-log(x-2)