Answer:
Option D:3/10
Step-by-step explanation:
If the perimeter is 28 units, then you know you will have to add the same four numbers to get the perimeter. What times 4 can get you to 28? 7. 7 x 4=28. So what plus 3 gets us to 7? 4. The answer is 4, or x=4.
I think it’s C. Sorry if I’m incorrect
Answer:
810
Step-by-step explanation: