Set up a piece-wise function to describe the relationship between the total monthly cell phone charge and the number of minutes of use. Let y represent the total cost of the phone bill and let x represent the total number of minutes. Write a piecewise function to describe the plan.

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?

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.