Is 8.224 a rational number

In a column proof the right column states your reasons

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.

Let x = a + bi and y = c + di and z = f + gi. which statements are true?