The time it takes Natalie to replace x cell phone screens is given by the equation t =
1 + 3x, where t gives the time in hours. How many hours would it take Natalie to
replace 8 screens?

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.