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lulbbyz
29.01.2020 •
Mathematics
Astudent scored 81 and 93 on her first two quizzes. write and solve a compound inequality to
find the possible values for a third quiz score that would give her an average between 85 and
90, inclusive.
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Ответ:
I hope this helps.
Ответ:
5x + 10y ≥ 60 ⇒ x+2y ≥ 12 (i)
x + y ≤ 12 (ii)
Step-by-step explanation:
Let the hours spent on exercising horse be x
Let the hours spent on cleaning stalls be y
According to question:
Rob can't work more than 12 hours. So eq. (i) will be x + y ≤ 12
Rob earns $5 an hour by exercising horses and $10 an hour cleaning stalls and he must make $60 . So eq. (ii) will be 5x + 10y ≥ 60.
Dividing eq. (ii) by 5, it will become x + 2y ≥ 12.
∴ system of inequalities are x + y ≤ 12 and x + 2y ≥ 12.