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Juan scored 82. Usea compound inequality to show the possible score x he got on his second test,if the average is strictly between 74 and 80?
2 Answers
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- PuzzlingLv 73 years agoFavorite Answer
Let x be the second score.
His average is *strictly* between 74 and 80:
74 < (82+x)/2 < 80
Multiply everything by 2:
148 < 82 + x < 160
Subtract 82 from everything:
66 < x < 78
Note: When something is *strictly* between, the endpoints are *not* included.
Answer:
66 < x < 78
- Anonymous3 years ago
66<=x<=78
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