janiyagoldsmith
25.01.2020 •
Mathematics
Working together, melissa and jing can mow a lawn in 5 hours. it would take melissa 8 hours to do the job alone. what is the value of r, the part of the lawn that jing could complete in 1 hour? a. 0.075.
b. 0.125.
c. 0.375.
d. 0.625.
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Ответ:
The amount of work completed by Jing in 1 hour is 0.075 which is option A
Step-by-step explanation:
Melissa & Jing can complete the work in 5 hours
This means that the amount of work completed by Melissa & Jing working together in 1 hour is (1÷5) = 0.2
Melissa will do the job in 8 hours, which means that the amount of job completed by Melissa working alone in 1 hour is (1÷8) = 0.125
The amount of work completed by Jing when he works alone in 1 hour will be the difference of amount of work completed by both of them in 1 hour with the amount completed by only Melissa in 1 hour.
There Amount of work completed by Jing in an hour = 0.2 - 0.125 = 0.075
Ответ:
f(-12) = -12(-12) + 100 = 144 + 100 = 244