5-x=3 work out the value of 3x squared

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.

You buy 4 items that cost 2.69 14.45 8.05 13.95 what is the estimated total round to the nearest dollar

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.