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Which statement summarizes how the chart illustrates the author position on ethanol

The distance d that a car can travel in a certain amount of time t can be found by multiplying the rate of speed r by the travel time. if a car has already travel 4 miles, the formula for the total distance travel is d= rt + 4. which of the following gives the value of r, in terms of d and t?

Break down of rocks and minerals into smaller particles without a change in composition is called_