4 because 4 x 4 =16 and 4+4=8
The three points and two points must swop, and the different slopes and the same slope must swop too.
Answer:

Step-by-step explanation:


So you will have to find the difference between each number so 6--2=8
and 8--2=10. So then I'm guessing you have to round 8 to 10. Sorry if this isn't all correct.
Answer:
Cost of 1 pound apple:4.80/6=2.4
cost of 9 pounds apple:2.4 ×9=21.6