Help please I’m not sure how to do this subject too well.

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

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.

Idon't want to fail summer school.the probabilities of contamination in medicine capsules due to the presence of heavy metals and different types of microbes are given in the table.the probability of capsule b having microbial contamination is (the same as, greater than, less than) the probability of capsule d having it.