Please help I just don’t know what to do with

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.

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?

What is the remainder when 3x^2-x-10 is divided by x-1 -6,-7,-8, or -9