What is the measure of angle c?

Can someone pls ! pls answer all. no explanation needed..

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )

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