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IrinaVladis [17]
3 years ago
14

For #4 I’m not sure if I’m correct. Can anyone help?

Mathematics
1 answer:
UkoKoshka [18]3 years ago
5 0

DF = DE + EF


So,


DF = 47 + 3x +10


We know that DF = 9x - 39, so:


9x - 39 = 47 + 3x + 10

9x - 3x = 57 + 39

6x = 96

x = 16


EF = 3x + 10

EF = 3.16 + 10

EF = 48 + 10

EF = 58


It's fine :)

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