Answers edited by Vince G.

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• Are any apostrophes needed in the following sentence? If so where?: Their houses doors all had to be the same color.
  
• A particle moves along a line so that its displacement at time t≥ 0 is given by s(t)=2t^3-24t+1, where s is measured in meters and t is measured in seconds. At what values of t does the particle change direction? Thank you!
  
• How do you solve #9x+6y=3# and #-3x+y=14# using substitution?
  
• How do you solve #2(x-5+2)=6# using the distributive property?