Algebra Factoring Practice Test Results

Question 1
67% answer correctly
Which of the following is a composite number?
31
6
17
11
Question 2
71% answer correctly
Which of the following is not a composite number?
17
38
9
28
Question 3
75% answer correctly
What`s the least common multiple (LCM) of 3 and 5?
15
30
16
3 and 5 have no common multiples