Helen wants to buy round plates for her mother. the radius of plates is 1 foot. what is the plate's circumference?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

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.