Write the set A=1,2,3,6,9,18) in (a) descriptive method (b) set builder method​

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost