If the perimeter of the triangle is 23 cm what is the length of the third side

What is the square root of 45? (step by step working plz)

Which of the choices shown could be used to prove that aacp=abcp ?

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.