9.) In isosceles trapezoid ABCD with AB=CD, if AB = 3x -15 and CD = 7x – 55, find AB.
B
(1) 10
(2) 25
(3) 15
(4) 30

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?