A Factory Is Polluting a River Such That at Every

question 69

Multiple Choice

A factory is polluting a river such that at every mile down river from the factory an environmental expert finds 20% less pollutant than at the preceding mile. If the pollutant's concentration is 700 ppm (parts per million) at the factory, what is its concentration 15 miles down river?

• A)140.00 ppm
• B)300.00 ppm
• C)24.63 ppm
• D)875.00 ppm
• E)30.79 ppm

---

Definitions:

Electrochemical Communication

The process of transmitting messages between neurons through electrical and chemical signals.

Nervous System

The body’s electrochemical communication circuitry.

Pulmonary

Related to the lungs or the respiratory system.

Endocrine

Pertains to the system of glands that release hormones directly into the bloodstream to regulate bodily functions.