What comes after a seahorse

Puzzle time 7.5

Is the orthocenter of a triangle on the inside ?

What is a possible solutions of the x> 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.