Either make the calculation or solve for x as appropriate. Round answers to two decimal places.
The table provides data on world copper production in millions of tons from 1900 to 2010. In the table year 0 is 1900, year 110 is 2010.
Year (0 is 1900) | World Copper Production (millions of tons per year) |
---|---|
0 | 0.4 |
10 | 1.0 |
20 | 1.1 |
30 | 1.6 |
40 | 2.2 |
50 | 2.2 |
60 | 3.6 |
70 | 6.0 |
80 | 7.2 |
90 | 9.1 |
100 | 12.8 |
110 | 17.0 |
Copper is among the most important industrial metals. Copper is used in electrical power cables, data cables, electrical equipment, automobile radiators, cooling and refrigeration tubing, heat exchangers, artillery shell casings, small arms ammunition, water pipes, and jewellery. Copper has been in use at least 10,000 years, but more than 95% of all copper ever mined and smelted has been extracted since 1900. As India and China race to catch up with the West, the copper supply chain is becoming more strained, leading to increased prices and an increase in copper theft. Since copper is a finite resource, at some point in the future new production from within the earth will diminish, and at some earlier time production will reach a maximum. When this will occur is a matter of dispute. Unlike fossil fuels, however, copper is scrapped and reused and it has been estimated that at least 80% of all copper ever mined is still available (having been repeatedly recycled). Wikipedia
Use a spreadsheet to plot the world copper production data. Add an exponential trend line and equation. Note that spreadsheets use the letters "exp" for "e^". For example, exp(2x) means e^(2x).