Which of the following is not a proportion?​

B and ?

Step-by-step explanation:

Cross multiply in each case and see if you get equality.  If you do, then the equation forms a proportion.

A)  1/4 = 3/12

      1(12) = 3(4)

         12 = 12  So, 1/4 = 3/12 is a proportion

B)   4/10 = 12/20

      4(20) = 10(12)

        80 = 120  which is untrue.  So, 4/10 = 12/20 is NOT a proportion

Now, can you do C and D?

there is no question content here, but you for the free points! : d