btsheygirl
10.10.2019 •
Mathematics
(x+21) + (2x+9)=90 i need for my geometry game
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Ответ:
(x+21) + (2x+9)=90
x+21+2x+9 = 90
3x+30 = 90
3x = 60
x = 20
Ответ:
This is the system of equations because it is 2 times more than nickels
So you have to make sure to put the two or it is wrong