Ella's test grades in her history class are 89, 94, 82, 84, and 98. What score must Ella make on her next test to have a mean
test score of 907
needed on the next test

x = 135 (probably not what you asked)

OR

x = 97.2 (probably what you asked)

Step-by-step explanation:

I'm not entirely sure what you mean by 907 so I will make two assumptions. You meant 97% OR 90.7%

97%

89+94+82+84+98+x/6 = 97

x = 135

89+94+82+84+98+x/6 = 90.7

x = 97.2

idk

step-by-step explanation:

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3