Warm Up
Let be the function that gives the cost , in dollars, of producing 1 watt of solar energy years after 1977. Here is a table showing the values of from 1977 to 1987.
0 | 80 |
1 | 60 |
2 | 45 |
3 | 33.75 |
4 | 25.31 |
5 | 18.98 |
6 | 14.24 |
7 | 10.68 |
8 | 8.01 |
9 | 6.01 |
10 | 4.51 |
Which expression best represents the average rate of change in solar cost between 1977 and 1987?
1.
2.
3.
4.
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