Brian cut an extra large round pizza into 12 pieces. seven of the pieces were eaten. what angle measure of pizza is left?

If seven pieces were eaten then they ate more than half, so i would say an obtuse angle is left. 
if you need exact degrees i would say about maybe 210 degrees out of 360 which is from the circle of the pizza
otherwise hope this helps :)

(-14+3/2b) - (1+8/2b) = -5 -5/2b(-10+b) + (7b-5) = 8b-15(7/2b-3) - (8+6b) = -5/2b-11(5+2b) + (2b+3/2) = 4b+ 13/2