Respuesta :

sqdancefan

Answer:

  D.  6.85r – 16.88s

Step-by-step explanation:

Use the distributive property to eliminate parentheses, then collect terms.

  4.2(3.9r -5.9s) +7.9s -9.53r

  = 16.38r -24.78s +7.9s -9.53r

  = (16.38 -9.53)r +(-24.78 +7.9)s

  = 6.85r -16.88s