Answer:
8 + 15i
Step-by-step explanation:
(-2 + 3i) + 2(5 + 6i) =
= -2 + 3i + 10 + 12i
= 8 + 15i
1,075,920,000,000 km³
300+90+9
-45=0+40+5
399-45=354
1000000
10x10x10x10x10x10=1000000