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12. Write the equation of a normal line to the function f(t) = logz(3x-1) at x = 1120. Two planes are flying towards Newark Airport,

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12. Write the equation of a normal line to the function f(t) = logz(3x-1) at x = 1120. Two planes are flying towards Newark Airport, one coming from the north is 5 miles away and flying at a rate of 516 miles/hour and one from the east is 12 miles away at a rate of 500 miles/hour. What is rate of change of the distance between the two planes at that instant in time

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