First to answer will be marked brailiest! worth 20 points!

The score on the next test must be between 86 and 98, inclusive

Step-by-step explanation:

Write an inequality using the average:

86 ≤ ≤ 90

Solve for x:

multiply everything by 3:

258 ≤ x + 83 + 89 ≤ 270

258 ≤ x + 172 ≤ 270

subtract 172 from everything:

86 ≤ x  ≤ 98

The score on the next test must be between 86 and 98, inclusive