First you need to multiple minus in second bracket, also in other side you need to multiple - 3 in bracket

Final answer is 0
A is the correct answer
2 + 3i + (-1) + 7i
1 + 10i
A triple number has 3 numbers and a double numbers has 2 numbers only.
Answer:
The answer is 4 1/8
Step-by-step explanation: