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caleighpeters
27.08.2019 •
Mathematics
Joni has two u.s coins in her pocket. one of the coins is not a dime. if the total value of coins in her pocket is 11 cents, what are the two coins.
penny
nickel
quarter
dime
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Ответ:
because it says one coin is not a dime
that does dot mean the other coin is not a dime
Ответ:
.. -4x +2y -4z = -4(-2) +2(-2) -4(4)
.. -4x +2y -4z = 8 -4 -16 = -12
Multiplying by -1/2 will put the equation into standard form.
2x -y +2z = 6