I will appreciate a quick answer

Abcd is a square. what is the measure of angle bac

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

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.