A long-distance telephone company charges a rate of 6 cents per minute or a 40-cent minimum charge per completed call, whichever is greater. find the cost, in cents per minute, for a 3-minute call.

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.

What is the sum of these mixed numbers 4 2/3+ 3 1/9

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6