The verb collaborate can use either with or in, and also on.The preposition with is used to state with whom the collaboration occurs.The prepositions in or on are used for the project or task being...
Mean can mean you are being rude or in math terms it is adding a set of numbers then dividing by the total amount. ex. If your numbers are 1,2,and 3 add them to get 6 and divide by 3. You get 2.