Look at pic 10 pts will mark brainilest

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

The square root of 9x plus 7 plus the square rot of 2x equall to 7

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.