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11.12.2019 •
Mathematics
Eric has some quarters and nickels in his pocket he has 30 total count the total value is $3.70 write a system that could be used to find you the number of quarters in and n the number of nickels
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Ответ:
Step-by-step explanation:
After defining variables as ...
q = number of quarters
n = number of nickels
we can write two equations. One of them expresses the total number of coins:
q + n = 30
The other expresses the total value of the coins:
0.25q + 0.05n = 3.70
The solution to these equations is (n, q) = (19, 11).
Ответ:
The number of books is the independent variable, the variable that you can decide to change.
The price of the books is dependent on the number of them. You cannot change it at will.