Hi! i REALLY need help with this IXL in math and im only at 36 points bc i keep getting things wrong.. can someone PLEASE help me ?? its areas of sectors (answer needs to be in simplest form)

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.