This table shows how the amount of money sadie makes from selling lemonade is related to the number of cups sold. how much does one cup of lemonade cost?

One cup of lemonade will cost $2.

Step-by-step explanation:

From simple observation and visual inspection we can conclude that one cup of lemonade costs $2.

If 9 cups of lemonade cost $18 then one cup of lemonade will cost $18÷9 = $2

If 2 cups of lemonade cost $4 then one cup of lemonade will cost $4÷2 = $2.

Therefore we can conclude that one cup of lemonade will cost $2.