You should ender 0.5 for a half note, 0.25 for a quater note, 0.125 for a eigth note, 0.0625 for a sixteenth note.
Simplify combining like terms on 8d2c+3dc+47d2
I did that equation on the side and I got 442, I hope this helps
I dont quite know whits being asked, but the missing value is 30
