Dont worry about it (the dumb questions).
But yea, for the MPC into the 802, you'd have Dual 1/4"-to-(Single) 1/4".
With the dual at the MPC, and the single at the mixer.
And for the BX5's, i dont know about what kind of inputs go into the Monitors, but the output of the mixer would be Dual 1/4".
Try that out. That's about all you should need.
Holla Back if you got any other questions. Even if there stupid ones.
PEACE