A blue bowling ball rolled with a force of 15 N accelerates at a rate of 3 m/sec2; a second red ball rolled with the same force accelerates at 4 m/sec2. What are the masses of the two balls? Make sure you pay attention to the units.

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?