Answer
a. True
b. False
c. False
d. False
Work Step by Step
3a.
This is a true statement; 3 is a real number because it is an integer, and all integers are real numbers.
3b.
This is a false statement; $\frac{1}{5}$ is not an irrational number because it can be written as 0.2.
3c.
This is a false statement; $\frac{1}{2}$ is a rational number but it is not an integer.
3d.
This is a false statement; 1 is not included in the second set.
