Solve for x . x + 30 divided by 11 equals 1

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

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.