Help pls it for math I’m doing a test and didnt take all notes help I will give the brainliest

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

The length of the line segment ac is 8x-9 what is the value of x

Barrett is comparing the membership fees for two museums. the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?