Can you please simplify c5 x c

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !

Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?

Plzzz answer both questions and i will give you 100 points