Question 47590
Sam 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 Sam must get on the last test to get a C grade. 

Let "x" be the minimum score Sam needs to make the 70 average.

EQUATION:
(75+63+68+x)/4>=70
206+x>=280
x>=74
Sam needs a score of at least 74 to achieve an average of 70 on the 4 tests.
Cheers,
Stan H.