You have cavities and you are looking for a cheaper dentist. dentist a costs $50 for the visit and $20 per cavity. dentist b costs $70 for the visit and $5 per cavity. when would dentist b be cheaper than dentist a?

Can some one me with this math problem?

Reflect the point (7,0) across the y-axis

The bottom of ignacio's desktop is 74.5cm from the floor. ignacios sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk.