Show y’all work please Y’all please help me with this I don’t understand

If the value of cos330°is√3/2 then find cos 165°.

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities

Carl is hanging pictures in his home. there is a space on a wall that has a width of 4 feet. carl has pictures with different widths. which picture width would fit in the space on the wall? a. 46 inches b. 60 inches c. 50 inches d. 54 inches