Peterson6164
04.07.2019 •
Mathematics
Matthew is 7 years older then twice the age of his sister. if matthew is 13, how old is his sister? (not subtraction,its much more)
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Ответ:
S = sisters ages
M =2S +7
M=13
13 = 2S+7
subtract 7 from each side
6 = 2S
divide by 2
3=S
sisters age is 3
Ответ:
the table please
Step-by-step explanation: