Posted by **cheryl** on Monday, March 19, 2007 at 11:58am.

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

Let X be the grade on the next test. The average is

(75+63+68+x)/4

That must equal or exceed 70.

Write that in mathematical form and convert ito an inequality for x.

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