The scatterplot above shows the pH of se...

The scatterplot above shows the pH of seven well water samples in West Texas with respect to the bicarbonate concentration in ppm(parts per million). The line of best fit is also shown.
A new well is discovered in West Texas with a bicarbonate concentration of 225 ppm. According to the line of best fit, which of the following best approximates the pH of the well water?

7.1

7.3

7.4

8.4

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