A student's grade in a course is the average of 4 test grades and a final exam that is worth three times as much as each test. Suppose a student has test grades of 90, 88, 81, and 94. Write an equation to model this situation where x is the student's grade on the final exam and y is the student's average for the course.
1 answer
AVG=(90+88+81+94+3x)/7