A logical argument arranged with statements and reasons.

What is the common difference in the following arithmetic sequence? 7,3,-1,-5

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

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.