Avery0103 Avery0103
  • 15-09-2015
  • Mathematics
contestada

2/5r -5 =7 ( what's r )

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elainelau161 elainelau161
  • 15-09-2015
2/5r-5=7
2/5r-5+5=7+5
2/5r=12
2/5r*5r=12*5r
2=60r
2/60=60r/60
1/30=r
which is 0.0333333333333 = r
I'm pretty sure this is correct because I double checked it
Answer Link
TSO
TSO TSO
  • 15-09-2015
[tex] \frac{2}{5} r-5=7\\\\ \frac{2}{5}r=12\\r=12\times \frac{5}{2} \\r= 6 \times 5\\ r=30[/tex]
Answer Link

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