Evaluate the expression when x = 8 and y = 12.
4xy

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Aconstruction worker has rope 9 m long he needs to cut it in pieces that are each 3 /5 m long how many such pieces can he cut without having any rope leftover?

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.