Easy 10 points for answering this question!
rewrite the expression by using grouping symbols. y • 5 + y • a
a. 5(y + a)
b. a(y • 5)
c. y • (5 + y) • a
d. y (5 + a)

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?