Henry is using a total of 16 ft. of lumber to make a bookcase. the left and right sides of the bookcase are each 4 ft. high. the top, bottom, and two shelves are all the same length labeled s. how long is each shelf? plzz you will get points.

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?