(2cosA+1) (2cosA-1)=2cos2A+1 prove that (correctly)

Find the percent cost of the total spent on each equipment $36, fees $158, transportation $59 a. 14%, 62%, 23% b. 15%, 60%, 35% c. 10%, 70%, 20% d. 11%, 62%, 27%

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation. which method should jeremy use?

How do you write 0.5% as a fraction