Jack is going to drive from his house to City A without stopping. An equation that determines Jack's distance from City At hours after leaving his house is
D = 220 - 550. What is the y-intercept of the equation and what is its
interpretation in the context of the problem?

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?