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Sam must have an average of 70 or more in his summer course to obtain a grade of C. His firs three test grades were 75,63, and 68. Write an inequality representing the score that Sam must get on the last test to get a C grade.

  • algebra -

    70 = (75+63+68+x)/4 ...with x being what he must get.

    So you solve that:

    70(4)-75-63-68 = x
    x = 74

    So therefore, Sam must get a 74 or above to get a C grade.

    x => 74

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