Select the correct answer from the drop-down menu. Subtracting 3xy2 from 8xy2 gives the same result as the expression:

A.) 3xy^2- 8xy^2

B.) -7xy^2- 2xy^2

C.) 7xy^2- 2xy^2

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?