Simplify the expression and write it with rational exponents

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)

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.