Your math test scores are 68 78 90 and 91 what is the lowest score you can iron on the next test and still achieve an average of at least 85

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98 is your answer

To calculate the lowest score you can earn on the next test while maintaining an average of at least 85, we can use the following steps:

1. Calculate the sum of the current test scores:
68 + 78 + 90 + 91 = 327

2. Determine the number of tests taken so far:
There are 4 test scores given.

3. Calculate the minimum total score needed to maintain an average of at least 85:
(Number of tests + 1) * Desired average = (4 + 1) * 85 = 425

4. Calculate the minimum score needed on the next test:
Minimum total score - Sum of current test scores = 425 - 327 = 98

Therefore, you would need to score at least 98 on the next test to maintain an average of at least 85.

To find the lowest score you can earn on the next test and still achieve an average of at least 85, we can use the following equation:

(68 + 78 + 90 + 91 + x) / 5 ≥ 85

Here, 'x' represents the score on the next test. To solve the equation, we can first simplify it:

327 + x ≥ 425

Next, let's isolate 'x' by subtracting 327 from both sides of the inequality:

x ≥ 425 - 327

x ≥ 98

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