Please help me it due today at 11:59pm plz help me will mark the brainiest please

Ineed me i stuck and i don’t want to get it wrong

Which expression is rational? 6. , square root two, square root 14, square root 49

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.