What is the coordinates of the library?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Change negative exponents to positive, then solve

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.