+1495 Evaluate:
Given: a=d/t2 and d=rt+1/2at2
Find the values of a and t when d=2 and r=3
+118670 Hello Manuel,
Why is it that you give your own questions points but you almost never give the answerers any points?
Also,
Why is it that you always say please, which is very nice, but you never say thank you?
+1495 Melody
I always say thank you to whoever answers my questions
but you don't see it because I always send the person a private message
Also, I forgot the give the others questioners points
And by the way, Thanks for the answer
+118670 You are welcome and if you send private messages that is really nice of you. 
It is also nice and important that you thank people publicly because it sets an example for others.
If new people do not see anyone else saying thank you then they are more likely to think that they, for some bizarre reason they are not supposed to say thanks. People copy the behaviours of others. :)
Welcome to the forum by the way. I know you have been here for over a month but that still isn't all that long.
+118670 Evaluate:
Given: a=d/t2 and d=rt+1/2at2
Find the values of a and t when d=2 and r=3
\(Given: a=\frac{d}{t^2} \;\; and\;\;d=rt+\frac{1}{2}at^2\\\text{Find a and t when d=2 and r=3}\\~\\ a=\frac{2}{t^2}\;\;(1) \;\; and\;\;2=3t+\frac{1}{2}at^2\;\;(2)\\ at^2=2 \;\;\;(1b)\\ sub \;1b\;into\;2\\ 2=3t+\frac{1}{2}*2\\2=3t+1\\1=3t\\t=\frac{1}{3}\\ \text{sub back into (1)}\\ a=2\div\frac{1}{3^2}=2*9=18\\ so\;\;t=\frac{1}{3}\;\;and\;\;a=18 \)
