1.        

a.       discrete

b.       continuous

c.        continuous

d.       discrete

e.       discrete

3.        

a.       discrete

b.       continuous

c.        discrete

d.       discrete

e.       continuous     

5.        

a. \{0.1 .2\}

b. an interval (a, b) (answers vary)

c. an interval (a, b) (answers vary)

d. \{4,5,6,7\}

e. \{2,3\}