Iwas taught how to do this but i need , as i’m having a brain malfunction

Find the multiplicative inverse of 8-12i

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.