im trying to help my sister can someone help i don't understand and her teacher doesn't want to help her

Equation for the calculation double 2 and then add 5

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.

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c