Here is the better photo... Please help

How can you construct perpendicular lines and prove theorems about perpendicular lines

Which expression is the factorization of x^2+10+21

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.