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# Word Problems

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1. Toxic pollutants:

The annual cost in dollars for removing p% of the toxic chemicals from a town's water supply is given by the formula:

C(p)= 500.000/(100 - p)

a) Use the accompanying graph to estimate the cost for removing 90% and 95% of the toxic chemicals.
b) Use the formula to find C(99.5) and C(99.9).
c) What happens to the cost as the percentage of pollutants removed approaches 100%?

2. Driving marathon:

Felix drove 800 miles in x hours on Monday.
a) Write a rational expression for his average speed.
b) On Tuesday he drove for 6 hours at the same average speed. Write a rational expression for his distance on Tuesday.

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#### Solution Preview

6.1
120.
Toxic pollutant: The annual cost in dollars for removing p% of the toxic chemicals from a town's water supply is given by the formula

C(p)= 500,000/(100-p)
a) Use the accompanying graph to estimate the cost for removing 90% and 95% of the toxic chemicals.
b) Use the formula to find C(99.5) and C(99.9).
c) What happens to ...

#### Solution Summary

This solution is comprised of detailed step-by-step calculations and analysis of the given problems and provides students with a clear perspective of the underlying concepts.

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