Pls help me with this problem

Convert 16 yards to feet use the conversion rate 3 feet = 1 yard

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.

What are the coordinates of a vertex of the hyperbola?