Find the intersection of the three sets: a = {–2, 7, 8, 11}, b = {–2, 7, 11}, c = {–2, 8, 11}. {–2, 7, 8, 11} {–2, 7, 11} {–2, 11} {11}

Jordan rides his bike 6 7/15 miles every day to deliver newspapers and to go to and from school. if his ride to and from school is 4 3/10 miles, how many miles is the trip to deliver newspapers? 1 1/3 1 1/6 2 1/6 2 4/5

Ineed in figuring out this problem.

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