esmiyoo esmiyoo
  • 25-04-2017
  • Mathematics
contestada

the total cost of 6 pens and 3 folders. A folder costs $1.15 more than a pen.

Respuesta :

irspow
irspow irspow
  • 25-04-2017
f=p+1.15

c=6p+3f, using f from above we get:

c=6p+3(p+1.15)

c=6p+3p+3.45

c=9p+3.45
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