4. It is estimated that as of 2015, the total amount of plastic waste generated on Earth was about 6300 million tonnes. Below is some detailed data from 1980 to 2015 indicating the total plastic waste generated, the amount of this plastic waste that has been sent to landfill, as well as the amount of this plastic waste that has been recycled. Note that these values are cumulative totals. 9000 total plastic waste generated plastic waste to landfill plastic waste recycled 8000- 7000- 6000 5000 4000 3000 2000 1000 10 20 30 40 50 Years since 1980 (a) Develop a linear model for the total amount W of plastic waste generated (in millions of tonnes) as a function of time t (years since 1980). Plastic waste (million tonnes) ► ■♦

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