The robber stole 280 dollars' worth of one-dollar bills. he also stole some 100-dollar bills, 50-dollar bills, and 20-dollar bills. which expression could represent the amount of money that was stolen? a) 280(100x+50y+20z) b) 100x+50y+20z-280 c) 280x+170 d) 170x+280170x+280 e) 100x+50y+20z+280

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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?

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3