Which of the following measures are equal to 60 degrees

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?