The volume of a sphere

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Kayla made observations about the sellin price of a new brand of coffee that sold in the three different sized bags she recorded those observations in the following table 6 is $2.10 8 is $2.80 and 16 is to $5.60 use the relationship to predict the cost of a 20oz bag of coffee.

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?