Add or Subtract

question 241

Multiple Choice

Add or subtract. Then simplify by collecting like radical terms, if possible. Assume that no radicands were formed by
raising negative numbers to even powers.
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Definitions:

Extinct Species

Species that no longer exist anywhere on Earth, having no living members.

Endangered Species

Species that are under a very high risk of extinction in the wild in the near future as identified by conservation status assessments.

Threatened Species

Species that are at risk of becoming endangered in the near future throughout all or a significant portion of their range.

Greenhouse Gas

Gases in Earth's atmosphere that trap heat, including carbon dioxide, methane, nitrous oxide, and fluorinated gases, contributing to global warming.