Without using a calculator how do you evaluate tan 5π/6.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later, she sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions, how much money did jody make?

If a=0.333333 and b=0.55555, what is the value of a+b