Add or Subtract as Indicated $a+b i$
- $[(2+6 \mathrm{i})-(10+10 \mathrm{i})]-(3-7 \mathrm{i})$

Multiple Choice

Add or subtract as indicated. Write your answer in the form $a+b i$ .
- $[(2+6 \mathrm{i}) -(10+10 \mathrm{i}) ]-(3-7 \mathrm{i})$

A) $15+9 i$
B) $15+3 \mathrm{i}$
C) $-11+3 \mathrm{i}$
D) $-11+9 i$