Help me out! I need this Brainliest answer and 15 points!

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

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.

Write as a product of two polynomials. 2(3–b)+5(b–3)^2