Roe bought a video game in Miami. The game was $30. Miami has a 7% sales tax. How much money did Roe pay for the video game including sales tax?

I'm terrible at math any here is appreciated.

What can you determine about the solutions of this system

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm