SOLUTION: An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 82, 64, and 98 on the first three exams. Write an inequality representing the sc

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Question 99699: An arithmetic student needs an average of 70 or more to receive credit for the course.
She scored 82, 64, and 98 on the first three exams. Write an inequality representing the score she must get on the last test to receive credit for the course.
A) x ≥ 41
B) x ≥ 38
C) x ≥ 34
D) x ≥ 36
Answer by Adam(64) About Me  (Show Source):
You can put this solution on YOUR website!
We know that average of 3 exams of which we know results + 1 undetermined shopuld equal or be higher then 70. We can write it as (82+64+98+x)/4 ≥ 70 we multiply the equation by 4 and get 82+64+98+x ≥ 70*4
x ≥ 280-82-64-98
x ≥ 36