What is the slope of a line perpendicular to the line with a slope of 3/5?

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what is the slope of a line perpendicular to the line with a slope of 35?

question 1 options:

a) 3/5

b) −3/5

c) 5/3

d) −5/3

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.