The contour map shows wind speed in knots during Hurricane Andrew on August 24, 1992. Use it to estimate the value of the directional derivative of the wind speed at Homestead, Florida, in the direction of the eye of the hurricane.

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70 60 70 80 Homestead 65 55 65 \ 75 60 55 50 45- -40 35 30 *Key West 10 20 30 40 (Distance in miles) 2016 Cengage Learning 8.