What value of x is the solution to the equation 2x+4=−2

This is so hard and it’s for a test

Which letters from the table represent like terms? a and b b and c a and d b and d

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.