Find the Indicated Nth Partial Sum of the Arithmetic Sequence

question 133

Multiple Choice

Find the indicated nth partial sum of the arithmetic sequence. -2.1, 2.5, 7.1, 11.7, ...., n=90

• A)-7996.5
• B)18,241
• C)18,648
• D)18,227
• E)18,234

---

Definitions:

Ecosystem Experiments

Controlled studies designed to investigate the relationships among organisms and their environment within an ecosystem.

Heterocysts

Specialized nitrogen-fixing cells found in some filamentous cyanobacteria, providing an anaerobic environment necessary for the fixation of atmospheric nitrogen.

Nitrogen Cycle

A biochemical cycle that involves the conversion of nitrogen into multiple chemical forms as it circulates among the atmosphere, terrestrial, and marine ecosystems.

Nitrification

A microbial process in the nitrogen cycle where ammonia is converted into nitrite and then into nitrate.