Take a look at the timeline included with "Native American Peoples: Epidemics." How does the information on this timeline reinforce the importance of the work the Brazilian government is doing on behalf of the country's indigenous tribes? Support your answer with evidence from the text.
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The correct option is: Option (B) Trevor isn't correct because -2i must also be a root

Explanation:
The roots given are: -7, 2i, +7.

We need to differentiate between the real roots and the imaginary roots.

The real roots are: -7 and +7.
The imaginary root given is: 2i

However, the imaginary roots ALWAYS come in pair like 
Because the imaginary roots come from the square root; In this case, the roots might be in the form of: . The square-root of the negative number yields the imaginary numbers (which can be positive or negative), which in this case is +2i and -2i.

Hence the correct answer is that Trevor isn't correct because -2i must also be a root (Option b).