When Lúcia plays golf at the Rolling Hills golf course, she loses about 12 balls on average. Wher she plays golf at the Meandering Meadows golf course, she loses about 8 balls on average. If Lúcia lost approximately 100 balls after playing at Rolling Hills r times and Meandering Meadows m times , which of the following equations best represents the relationship between and m?

A) 8r+12m=100
B)12r+8m=100
C)12r-8m=100
D)8r-12m=100

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?