Algebra Factoring Practice Test Results

Question 1
90% answer correctly
What`s the least common multiple (LCM) of 7 and 2?
42
28
56
14
Question 2
71% answer correctly
Which of the following is not a composite number?
28
38
9
17
Question 3
76% answer correctly
Which of the following sets of factors do 68 and 60 have in common?
{17, 34, 68}
{1, 2, 4}
{4, 17, 34, 68}
{1, 2, 4, 128}