Is -5x+2-4=2x an expression or an equation

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c?

Which equation represents the line that passes through the points and (4, 10) and (2, 7)? y = 3/2x - 11y = 3/2x +4y = - 3/2x + 19y = - 3/2x + 16

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