Evaluate each expression x=-3,y=6,z=-4what is x+y+(-1)

Pls! does anybody know a shortcut for answering these types of questions in the future?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

To finance her community college education, sarah takes out a loan for $2900. after a year sarah decides to pay off the interest, which is 4% of $2900. how much will she pay