Which of the following represents the difference of the polynomials below?

(9x^3+2x+11)-(6x^3+4x^2+3x+1)

•A. 9x^3+4x^2-x+12
•B. -3x^3-4x^2-x+12
•C. -3x^3-4x^2-x+10
•D. 3x^3+4x^2-x+12

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?