Pls help me answer this question

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.

What function has a range {yly< 5}? question on picture above^

The actual length of side t is 0.045cm. use the scale drawing to find the actual side length of w