exam Maths Puzzle Numerical Ability

y=4x; y=4x-17

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exam Other Question

This is a 4 part question any help would be great.Thanks in advance.
Graph the following data:year 1989, 1990, 1991, 1992, 1993 and Median Home Cost $93,100; $97,500; $99,700; $10
Find the least common multiple of 3, 6, and 9.

A) 27 B) 9 C) 36 D) 18

Can somene please help me with this? Would this be D) 18?