8. What are the factors of 50?
a. 1, 2, 3, 4, 5, 10
c. 1, 2, 5, 10, 25, 50
b. 1, 3, 21, 25
d. 3, 7, 9, 2, 25, 50
9. How many factors are there in 28?
a. 4
b. 6
c. 8
d. 10​