The circle below is centered at the origin and has a radius of 5. What is its equation?
A. x2 - y2= 5
B. x2 + y2 = 25
c. x2 + y2 = 5
D. x2 - y2 = 25

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?