Which of the following is a proportion? a. 4/6=8/12 b. 14/21=9/12 c. 5/7=10/12 d. 9/15=12/18

A

Step-by-step explanation:

4/6 is 2/3. 8/12 is 2/3, therefore they are proportional.

b. 14 / 21 is 2/3. 9/12 is 3/4, so the two are not proportional.

c. 5/7 doesn't simplify and 10/12 is 5/6, so they are no proportional.

d. 9/15 is 3/5. 12/18 is 2/3, so they are not proportional.

A

Step-by-step explanation:

4 (2) = 8

6 (2) = 12