6.1#15

Hi Dr. Taylor, I apologize for the late email but I really do not get what I am doing wrong. This answer should be right. I have tried u subbing many times. and this is my most simplified answer.

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I think what you've written would be correct, except your location of parentheses might make it ambiguous whether you meant 1/(27[e^(-3t)][9t^2+6t+2] ) or ([e^(-3t)][9t^2+6t+2])/27. Try something like (1/27)[e^(-3t)](9t^2+6t+2) and see if webwork likes you better.