I need help with the r value on all three please (don't worry about the others)

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.