monster09 monster09

19-01-2017
Mathematics

contestada

want is the solution?
21 = 42 - 3r

A. r = -8
B. r = -7
C. r = 7
D. r = 8

Respuesta :

19-01-2017

21 = 42 - 3r
-21 = -3r
r = 7

So C.

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