Question 1 solve for n -2.34n = -12.168 a) n = 9.828 b) n = -9.828 c) n = 5.2 d)n = -5.2 question 2 solve for n n = -5 14.3 a) n= 71.5 b) n= -19.3 c) n= -71.5 d) n= 19.3 question 3 solve for n n = -2 -12.168 a) n= -24.336 b) n= 9.828 c) n= 24.336 d) n= -9.828

Can some one me with these questions

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

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?