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14.05.2021 •
Mathematics
Please help! With math problem:))
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Ответ:
B - -1
Step-by-step explanation:
x+y=1
x-y=3
x-y +y = 3 +y
x=3 +y
x+y =1
(3+y) +y=1
3 + 2y= 1
2y= -2
y= -1
Ответ:
$75 x .20=$15
75-15=$60