SOLUTION: A student has scores of 75, 79, and 81 on three government exams. What score does she need on a fourth exam to give her an average of 80 or better. Let x represent the fourth test

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 Click here to see ALL problems on Graphs Question 148535: A student has scores of 75, 79, and 81 on three government exams. What score does she need on a fourth exam to give her an average of 80 or better. Let x represent the fourth test score.. Answer by jim_thompson5910(28595)   (Show Source): You can put this solution on YOUR website! Let x=score on fourth exam So the average A of all 4 exams are 75, 79, and 81 Since the average must be greater than or equal to 80, this means that the right side is greater than or equal to 80 Set the right side greater than 80 Multiply both sides by 4. Combine like terms on the left side. Subtract from both sides. Combine like terms on the right side. ---------------------------------------------------------------------- Answer: So the answer is which means that the student must get an 85 or better on the 4th exam.