Define two sets as follows: j={5,15,25,35,45,55,} k={9,18,27,36,45,54,} which of the following numbers is an element of j∩k ?

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The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

What are the steps to solving the inequality 3b + 8 ≥ 14?