World consumption of lead is running at the rate of 4.7e0or million metric tons per year, where t is measured in years and t = 0 corresponds to 2000. Determine when the world's known resources of 140 million metric tons of lead will be exhausted.

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A: Let's find.

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.