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List the elements of the set in roster notation. (enter empty or ∅ for the empty set.) {x | x is a letter in the word hippopotamus}

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be