Can I please get help with it

What is the value of x in the diagram below?

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.

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 4x^2 - 19x- 5