#1 John is 4 inches taller than David, who is k inches tall. Write an expression for John's height in inches.
#2 Simplify the expression. 19 − 5[5 − (−5) 3 ]
#3 Find the union and intersection of the pair of sets. A is the set of prime number factors of 15. B is the set of prime number factors of 18.
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