Apay for service internet company charges 5 per hour for the first 3 hours of service plus a $10 connection fee

What does x = in this equation x+3+2x=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.

Which graph of a hyperbola represents the equation 16x^2-y^2=16