What did the Interstate Commerce Act ban in 1887?

Applying only to railroads, the law required "just and reasonable" rate changes; prohibited special rates or rebates for individual shippers; prohibited "preference" in rates for any particular localities, shippers, or products; forbade long-haul/short-haul discrimination; prohibited pooling of traffic or markets.

Explanation:

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1) the degree of the function is odd, so the ends of the graph continue in opposite directions. because the leading coefficient is positive, the left side of the graph continues down the coordinate plane and the right side continues upward.