Which equation is true when the value of x is -6

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For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

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.