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Plot the average gdp over time, seperately (but on the same graph) for cities that started programs in each of the years from 1989 to
Plot the average gdp over time, seperately (but on the same graph) for cities that started programs in each of the years from 1989 to 1991. Please provide the answer with R codes.
| year | city | startyear | gdp |
| 1990 | 1 | 1989 | 265 |
| 1991 | 1 | 1989 | 266 |
| 1992 | 1 | 1989 | 275 |
| 1990 | 2 | 1989 | 266 |
| 1991 | 2 | 1989 | 422 |
| 1992 | 2 | 1989 | 526 |
| 1990 | 3 | 1990 | 332 |
| 1991 | 3 | 1990 | 520 |
| 1992 | 3 | 1990 | 225 |
| 1990 | 4 | 1991 | 652 |
| 1991 | 4 | 1991 | 366 |
| 1992 | 4 | 1991 | 991 |
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Prealgebra
Authors: Elayn Martin Gay
7th edition
978-0321955043
