Density: The total weight of a rock depends on its size and is proportional to its density. In this context, density is the weight per cubic inch. Let w denote the weight of the rock in pounds, s the size of the rock in cubic inches, and d the density of the rock in pounds per cubic inch.
a. What is the total weight of a 3-cubic-inch rock that weighs 2 pounds per cubic inch?
b. Write an equation that shows the proportionality relation. What is the constant of proportionality?
c. Use the equation you found in part b to find the total weight of a 14-cubic-inch rock with density 0.3 pound per cubic inch.
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