Here is the answer.
You just have to remember the given formula.
Answer:
16
Step-by-step explanation:
Look at the table for each type of bird. 5x=15. 6x=18. 10x=30. What would you multiply each of those by to get your answer and find the difference? 5x=15; x= 3. It is the same for each number. So the difference is by 3. I think if I understand this correctly, that would be how you do it. Does this help?
Answer:
18÷n or 18a
Step-by-step explanation: