Does anyone know this :C

Which is the most efficient first step to solve x in the equation 3.7x - 18 = -4.3x -34 a. add 3.7x to both sides of the equation. b. add 4.3x to both sides of the equation. c. subtract 18 from both sides of the equation. d. subtract 34 from both sides of the equation.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Is the figure congruent? yes or no?