SOLUTION: Sam must have an average of 70 or more in his course to obtain a grade of C. His first three test grades were 75,63,68.Write an equality representing the score Sam must get on the
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Question 52972: Sam must have an average of 70 or more in his course to obtain a grade of C. His first three test grades were 75,63,68.Write an equality representing the score Sam must get on the last test to get a grade of C. McGraw Hill, Chapter 2.Exercise 7. Problem number 92. Sorry no isbn. Thanks so much!!!! Answer by checkley71(8403) (Show Source):
You can put this solution on YOUR website! (75+63+68+x)/4=70 or (206+x)/4=70 or 280=206+x x=280-206 or x=74 the minimum scor needed on the 4 th test to maintain a 70 average on the 4 tests.
proof (75+63+68+74)/4=70 or 280/4=70 or 70=70
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