Question
What is the sum of the amounts of lead produced in $1990,2000,$ and $2007 ?$
Step 1
In 1990, it's a little over three million, so we estimate it as 3.25 million metric tons. In 2000, it's about the same, so we also estimate it as 3.25 million metric tons. In 2007, there's a slight increase but it's not quite four million, so we estimate it as Show more…
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The Real Number System
Properties of Real Numbers
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