At the Pflugerville Cinema, the cost of 2 boxes of popcorn and I soda is $11.50. The cost of 3 boxes of popcorn and 4 sodas is $27.25. Write a pair of equations that can
be used to determine p, the cost of a box of popcorn, and s, the cost of a soda.

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.