Answer:
First option: 
Second option: 
Fourth option: 
Step-by-step explanation:
Rewrite each equation in the form
and then use the Discriminant formula for each equation. This is:

1) For
:

Then:
Since
this equation has no real solutions, but has two complex solutions.
2) For
:

Then:
Since
this equation has no real solutions, but has two complex solutions.
3) For
:

Then:
Since
this equation has one real solution.
4) For
:
Then:
Since
, this equation has no real solutions, but has two complex solutions.
Answer:
2000 x 0.03 = 60
2000 + 60 = 2060
2060 x 0.03 = 61.8
2060 + 61.8 = 2121.8
Step-by-step explanation:
Answer:
161,084,000
Step-by-step explanation:
7 x 11,506,000 = 80,542,000
80,542,000 x 2 = 161,084,000