aubbiek aubbiek

15-08-2018
Mathematics

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

For 4 Im not sure if Im correct Can anyone help class=

Respuesta :

a5904640 a5904640

15-08-2018

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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