Simplify (6^-2) (3^-3) (3•6)^4

If value of cos330° is √3/2 then find tan165°.

Can someone explain to me how to do

There are three grizzly bears in the city zoo. yogi weighs 400.5 pounds, winnie weighs 560.35 pounds, and nyla weighs 628.29 pounds. what is the average weight of the three bears? (hint: what do they weigh all together? ) a. 502.97 pounds c. 604.38 pounds b. 529.71 pounds d. 794.57 pounds