Jerry is driving across the country at a constant speed. Jerry enters Intersate 90 and and starts a clock as he passes mile marker 73. After 4.3 hours, Jerry passes miles marker 417. Represent the time elapsed in hours using the independent variable t. Represent the mile marker passed at time t with the dependent varlable z. At what speed is Jerry driving? 80 miles per hour Write a formula to compute the mile marker z as a function of t. What mile marker is Jerry passing when 7.9 hours have elapsed? 705

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