Determine the greatest common factor for the pair of numbers. 28, 40 select one: a. 16 b. 8 c. 4 d. 28

C

Step-by-step explanation:

     28                 40

      ∧                   ∧

     4 7               4 10

     ∧                 ∧   ∧

    2 2              2 2 2 5

28: 2 * 2 * 7

40: 2 * 2 * 2 * 5

What do they have in common?  two 2s

GCF: 2 * 2 = 4

The greatest common factor is 4.  28 is not divisible by 16 and not divisible by 8.  40 is not divisible by 28.  28 and 40 are divisible by 4 however.  28 divided by 4 is 7.  40 divided by 4 is 10.  Therefore the answer is C.. 4

idk

step-by-step explanation: