I need the answer plz

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

(! ) three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)