What is the circumference of the circle with radius of 30

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.

How many 2/5s are in 1 and 1/2 plz someone me right now

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok