Question

The predicted cost C (in hundreds of thousands of dollars) for a company to remove
% of a chemical from its waste water can be modelled by
=
142
(10+)(100−)
, 0 ≤ < 100
Find the rate of change in the cost when = 25% and = 75%

Answer 1

Corrosion is a natural process, which converts a refined metal to a more chemically stable form, such as its oxide, hydroxide, or sulphide. It is the gradual destruction of materials (usually metals) by chemical and/or electrochemical reaction with their environment. Corrosion degrades the useful properties of materials and structures including strength, appearance, and permeability to liquids and gases.