Jane bought a number of watermelons for $150. If each watermelon had been $5 more, 5 fewer would have been purchased but Jane would have still spent $150. Find the price of each watermelon. (Hint: let x be the number of watermelons and $y be the cost of each.)

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?