Need help ASAP please if you know the answer to all of these please please help me i need the answer right now i have 10 minutes left. Please help

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Will mark ! (10 points also! ) if x varies inversely with y and x =6 when y= 10, find y when x=8 a. y=4.8 b. y=7.5 c. y=40/3 d. y=4/15

Abox of chocolates cost $7 which equation relates the number of boxes sold parentheses x parentheses and total cost of the boxes sold parentheses y parentheses