Write the solution set of the equation $x^2 + x - 2 = 0$ in roster form.

In the following,state whether $A = B$ or not:
$A = \{ x: x \text{ is a multiple of } 10 \}$
$B = \{ 10, 15, 20, 25, 30, \ldots \}$

Which of the following is an empty set?

If a set $A$ has $n$ elements,then the total number of subsets of $A$ is

List all the elements of the following set:
$B = \{ x : x \text{ is an integer}; -\frac{1}{2} < x < \frac{9}{2} \}$

Which of the following is a set? Justify your answer.
The collection of questions in this chapter.