Answer:
98 is the lowest score that you can earn on the next test and still achieve an average of at least 85.
Explanation:
Math test scores are: 68, 78, 90, and 91
Average of the math test score = A = 85
Let the lowest score needed to achieve an average of 85 be x
Average =





98 is the lowest score that you can earn on the next test and still achieve an average of at least 85.