Analyze the residual plots and identify which, if any, of the conditions for an adequate linear model

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Analyze the residual plots and identify which, if any, of the conditions for an adequate linear model is not met.
1.
15 10 5 -5 -10 -15 - 5 15 25 Explanatory Residuals

2.

-2 5 15 25 Explanatory Residuals 2.

3.

4.

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