If I have two missing assignments but the rest of my grades are good what would be my finale average or close to it

Acircle has a circumference of 28.36 units what is the diameter of the circle

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

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