after completing an activity it will mark your work ,and the answers that were incorrect will be highlited for you to attempt again .if you are unable to get the correct answer there will be an icon viewed on the side of the screen that reads 'view solutions',click on it and the solutions to all the questions that you did in your activity.Math
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At the back of the book.
how many minutes difference? 11.40 12.25
not on the net :(