To get an average score of 80% (out of four exams), a total of 4*80%=320% is needed, so the minimum required for the 4th test is 320-(75+97+60)=88.
To get an average score of 89% (out of four exams), a total of 4*89%=356% is needed, so the maximum required for the 4th test is 356-(75+97+60)=124, which is impossible.
So the next exam grade must range between 88 and 100 to get a grade b in the class.
Hoped I help! Mark brainly it would help<3
Answer: n=4
Step-by-step explanation:

add 9 to both sides


divide both sides by -9

Brainliest please
Answer:
13
Step-by-step explanation:

Get x to one side
So minus 90 from each side

-90÷-3=30
Answer: x=30
Answer :
F-1(x)=-x/4-7/4
This is right
Go get help to sum sites!!!!!