October 9, 2015

Homework Help: Math

Posted by Katherine on Wednesday, September 22, 2010 at 5:19pm.

In Wilbur's math class, his grade is based on the average score of six tests, each worth 100 points. Wilbur always worries about his grade. He knows that his average on the four first tests is 88.5. What is the lowest average he could get on his next two tests and still average 90 overall...

please help me i am very confused.....

i need the formula

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