The value of r2 = 0.89 tells us that about of the variation in the of the semitrucks is accounted for by the linear relationship created with of the semitrucks.

The coefficient of determination, r², gives the proportion of variation in the response variable accounted for by the linear relationship. Since r² = 0.89, about 0.89 × 100% = 89% of the variation is accounted for. The correct choice is 89%.

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