Susan is a high school math teacher. Each week, she receives 8 quizzes to grade from each of s students. Assuming each week begins with no quizzes left over from the previous week, the number of quizzes that she has left to grade at the end of each day can be estimated with the equation , where q is the number of quizzes and d is the number of days she has worked that week.What is the meaning of the 10 in the equation?

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Susan is a high school math teacher. Each week, she receives 8 quizzes to grade from each of <em> s students. Assuming each week begins with no quizzes left over from the previous week, the number of quizzes that she has left to grade at the end of each day can be estimated with the equation <img alt='images' class='middle1' src='https://www.fatskills.com/images2/SAT/eq03041.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>q</m:mi><m:mo>=</m:mo><m:mn>8</m:mn><m:mi>s</m:mi><m:mo>-</m:mo><m:mn>10</m:mn><m:mi>d</m:mi></m:mrow></m:math>-->, where <em> q is the number of quizzes and <em> d is the number of days she has worked that week.<br>What is the meaning of the 10 in the equation?