To pass a course with an upper a grade, a student must have an average of 90 or greater. a student's grades on three tests are 91, 94, and 89. find what score the student must get on the next test to get an upper a average.

The student must get at least 86 in the next text in order to get an upper A average.

Step-by-step explanation:

The scores in the three tests are: 91, 94 and 89

The average score here is = 91 (rounded off to nearest whole number)

In order to get an Upper A average after tackling the next test, the students total score in the four tests must be 90 × 4 = 360

Let's say the student scores x in the fourth test.

Then; 91 + 94 + 89 + x ≥ 360

274 + x  ≥ 360

x ≥ 360 - 274

x ≥ 86