the answer is B because to get the total cost, first divide 450 by 50. This gives us 9. We then multiply 9 by $600 to get a total of $5400.
7(6) x 7(5) = 7(6+5) = 7(11) is the simplified answer.
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It means 2.5m/s multiplied by 2500 to get the total distance in meters