X^2+15^2=21^2
Help me please how do I figure out X after getting the totals of b and c?

Arectangular prism is 3 meters long, 6 meters wide, and has a height of 9 meters. what is its surface area?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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?