Answers edited by Vince G.
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How do you solve #9x+6y=3# and #3x+y=14# using substitution?

A particle moves along a line so that its displacement at time tâ‰¥ 0 is given by s(t)=2t^324t+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 #2(x5+2)=6# using the distributive property?

Are any apostrophes needed in the following sentence? If so where?:
Their houses doors all had to be the same color.