PLEASE HELP ME I DONT UNDERSTAND!

Select all the correct statements. the amount in dollars an electrician charges in terms of the number of hours worked is represented by the function y = 22x + 42. from the function, identify all the phrases that hold true for the situation. the electrician charges an initial fee of $22 the y-variable represents the number of hours the electrician charges an initial fee of $42 the electrician charges $22 for every hour worked the x-variable represents the electricians charges in dollars the electrician charges $42 for every hour worked

Which expression is equivalent to the expression shown?

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me