Writing linear Equations?

What is the measure of the smallest angle in the diagram? 15 29 32 45

Ineed i been stuck on this question since yesterday

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.