What do you do in 48 hours after you spend 33 hours of it watching netflix? how many hours did i spend cleaning, sleeping, writing, shopping? slit the answers

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

Could someone with number 1 and 2

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.