What’s the surface area for this figure? (If u can please help!)

Triangle xyz has vertices x(1,3), y(0,0)

Which number completes the inequality? 2/3 < _ < 7/9

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?