Determine whether the function f(x) = x3 + 5 is one-one or not. answer yes or...

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Determine whether the function f : Z Z Z is onto if a) f (m, n) = m + n. b) f (m, n) = m2 + n2. c) f (m, n) = m. d) f (m, n) = |n|. e) f (m, n) = m n.
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