Boris buys 5 markers and a 29 cent eraser for a total of $3.24. how much does each marker cost?

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Scarlet bought three pairs of sunglasses and two shirts for $81 and paula bought one pair of sunglasses and five shirts for $105 what is the cost of one pair of sunglasses and one shirt?

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.