Creative Confectioners is planning to introduce a new brownie. A small-scale "taste test" was conducted to assess consumers' preferences (Y) with regard to moisture content

(X₁)

and sweetness

(X₂).

Data from the taste test may be found in the table below.

Moisture	Sweetness	Preference
2.8	4.5	70
3.1	4.3	74
3.9	5.2	73
4.4	5.4	76
4.4	6.1	75
5.0	6.4	79
4.8	7.8	81
5.6	8.2	82
6.3	7.9	83
7.0	8.3	86
7.7	8.9	89
7.7	10.0	86
8.5	10.1	85
8.8	10.7	82
9.4	11.0	77
9.6	12.1	75

(A) Estimate the parameters for the following regression function:

_i = b₀ + b₁X_1i + b₂X_1i² + b₃X_2i + b₄X_2i²

What is the estimated regression function? (Enter your answer using X₁ For X_1i and X₂ for X_2i. (Round your numerical values to four decimal places.)

_i =(???)

(B) Using the estimated regression function in part (c), what is the expected preference rating of a brownie recipe with a moisture content of 7 and a sweetness rating of 9.5? (Round your answer to the nearest integer.)

(???)