michaela134
18.03.2021 •
Mathematics
Solve the system of equations by the substitution method.
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A.
The solution is
nothing. (Simplify your answer. Type an ordered pair.)
B.
There are infinitely many solutions.
C.
There is no solution.
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Ответ:
8 hours
Step-by-step explanation:
t = time for Bob and Nina to make 60 leashes
Bob = 7 in 2 hr = 3.5 in 1 hr
Nina = 4 in 1 hr
3.5 + 4 = 7.5 leashes per hour
t = 60/7.5 = 8 hours