Askateboarding park charges $7 per session to skate and $4 per session to rent safety equipment. your friend rents safety equipment every time he skates. last year, he spent $99 total for skating charges and equipment rentals. how much did he pay to rent safety equipment last year? explain!

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?