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david7962
24.09.2019 •
Mathematics
Ralph is an electrician. he charges an initial fee of $24, plus $33 per hour. if ralph earned $189 on a job, how long did the job take?
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Ответ:
Charge = $24 + $33 per hour
Let the time worked be = x.
For x hours, the cost = 33*x = 33x
Charge = 24 + 33x
24 + 33x = 189
33x = 189 - 24
33x = 165
x = 165/33
x = 5
The job took 5 hours.
I hope this helped.
Ответ:
Velocity = 75 sec/lap
Step-by-step explanation:
First we must know how long it should take to complete all the laps.
15lap*(1min and 25sec per lap) = 15lap*(85sec/lap) = 21min and 15sec
if the first 10 laps have 1min + 30sec, then 10lap*(1min+30sec per lap) = 10lap*(90sec/lap) =900sec/(60sec/min)=15min
Then 21min+15sec - 15min = 6min +15sec This is the time in which you must take the last 5 laps to average 1 minute with 25 seconds throughout the race
so,
6min + 15sec = 360sec +15sec = 375sec/5lap = 75sec/lap
Note: 15lap*(85sec/lap)= 1275sec/(60sec/min)=21.25 min= 21min + 0.25min*(60sec/min) =21min + 15sec