Sarah needs to have a plumber come to her house and fix a leaky faucet in her
bathroom. The plumber charges $50 to come to her home and an additional $30.75
every hour he works on the job. Sarah only has $234.50 in her savings for the
repair. What is the maximum amount of hours that Sarah can have the plumber work
on her faucet?
A 9
B 7
C 6
D 8
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OpenStudy (mathsucks321):
@mathstudent55
OpenStudy (berrymox):
234.50 = 50+30.75h
OpenStudy (mathsucks321):
Explain?
OpenStudy (berrymox):
One time charge of 50, plus 30.75 per every hour is equal to the max money Sarah has to pay with
OpenStudy (mathsucks321):
How would I get h
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OpenStudy (berrymox):
h is just a variable for hours, solve for h
OpenStudy (berrymox):
Or do you not know how?
OpenStudy (mathsucks321):
Wait ill try
OpenStudy (mathsucks321):
I got 6 :/
OpenStudy (berrymox):
yup
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OpenStudy (mathsucks321):
Ty
OpenStudy (berrymox):
6 is not just 6, but the number of hours
OpenStudy (mathsucks321):
I know :)
OpenStudy (mathstudent55):
Plumber cost: fixed $50 plus $30.75 per hour
If the plumber works h hours, the hourly fee will be 30.75h
The plumber cost, then, is
30.75h + 50
She has 234.50
The cost expression must be less than or equal to 234.50
\(30.75h + 50 \le 234.50\)
Solve for h.
Subtract 50 from both sides:
\(30.75h \le 184.50\)
Divide both sides by 30.75
\(h \le 6\)
Answer: she can hire the plumber for at most 6 hours.
OpenStudy (mathsucks321):
Thank you both!!
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