A few days ago
An arithmetic student needs?
An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 67, 74, and 63 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 >= 78
B) x >= 81
C) x >= 76
D) x >=74
Top 4 Answers
A few days ago
Favorite Answer
c) x>=76
0
A few days ago
The average of the four scores must be 70.
Let S4 = the last score, S1=1st score, S2=2nd score, S3 = the 3rd score, and A = the average score.
The formula for average is “the sum of all the scores devided by the number of scores”, or
(S1+S2+S3+S4)/4 = A
(67+ 74 + 63 +S4)/4 = 70
204+S4 = 70(4)
S4 = 280 – 204
S4 = 76
Therefore, the last test must have a score of at least 76, so that the average of the four tests is 70.
0
A few days ago
(67 + 74 + 63 + X) / 5 = 70
(70 * 5) – 67 – 74 – 63 = X
X >= All that junk up top that needs to be punched out.
0
A few days ago
Por lo menos debe obtener 76 o más
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