(-8 3/4) +(-2 5/6) +(-1 1/5)
= -((8 +2 +1) +(45/60 +50/60 +12/60))
= -(11 +107/60)
= -(12 47/60)
= -12 47/60
36 in expanded form is 30+6
Yes I think so it would be a mixed number
So, basically substitute as many times as they tell you (I don;t see it):
a1=4, a2=2*4-1=7, a3=2*7-1=13, ... As you see it grows up pretty quickly so that's why I think your statement may be missing how many times.