You seem to have rounded your objective function slightly. For the x6 coefficient, I have 0.865 instead of 0.87. In this particular case it's important not to round if you can avoid it. Otherwise our objective functions now agree.

I'll assume you've forgotten to write the + signs between terms of the constraints. In that case, the ones you've listed all agree with my versions. However, you've forgotten several. You need to include the constraints given by the following sentence from your attachment: "We must make at least 10 gallons of each flavor and no more than 25 percent of all the ice cream produced can be flavors with nuts."