Two times a number plus four is 22. what is the number

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Solve the system by the elimination method. 3x - 2y - 7 = 0 5x + y - 3 = 0 to eliminate y, the lcm is 2. which of the following is the resulting equations? 1.3x - 2y - 7 = 0 5x + y - 3 = 0 2.3x - 2y - 7 = 0 -10x - 2y + 6 = 0 3.3x - 2y - 7 = 0 10x + 2y - 6 = 0

12x + 1 = 25 solve the following equation. then place the correct number in the box provided.