PLEASE HELP! An airplane flying at an altitude of 18,000 feet has just begun its descent, and it will descend at a rate of 450 feet per minute.

Which of these equations represents the airplane's altitude, y, in feet after it has been descending for x minutes?

A. y equals negative 450 x minus 18,000

B. y equals negative 450 x plus 18,000

C. y equals 450 x minus 18,000

D. y equals 450 x plus 18,000

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?