Alex delivers newspapers around his neighborhood. Every Sunday, he delivers p papers to each of s streets. Assuming he delivers the same number of papers each Sunday, the number of papers that he has left to deliver after each street day can be estimated with the equation , where d is the number of streets that he has delivered to and n is the total number of papers delivered each Sunday.If Alex adds c streets to his current route, which new equation represents the number of papers that he delivers each Sunday?

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Alex delivers newspapers around his neighborhood. Every Sunday, he delivers p papers to each of s streets. Assuming he delivers the same number of papers each Sunday, the number of papers that he has left to deliver after each street day can be estimated with the equation <img alt='images' class='middle1' src='https://www.fatskills.com/images2/SAT/eq03321.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>n</m:mi><m:mo>=</m:mo><m:mi>p</m:mi><m:mi>s</m:mi><m:mo>-</m:mo><m:mi>d</m:mi><m:mi>p</m:mi></m:mrow></m:math>-->, where d is the number of streets that he has delivered to and n is the total number of papers delivered each Sunday.<br>What is the meaning of the pd in the equation?






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