bridges connect land masses
About 400 bridges connect the 118 islands that make up Venice.
The Queensboro Bridge, The Williamsburg Bridge, The Manhatten Bridge, and The Brooklyn Bridge
About 30, depending on where in Manhatten you are
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Assuming that each bridge can connect at most two vertices, you will need at least 4 bridges to connect seven vertices. Conversely, two bridges will connect at most four vertices.
Everyone says its the seven mile bridge, it's 6.57 miles long I don't think it is
Just one: The George Washington Bridge. New Jersey is also connected to New York City via the Bayonne and Verrazano Bridges. The Bayonne Bridge connects New Jersey to Staten Island, and the Verrazano connects Staten Island to Brooklyn. But this technically does not count, since you asked, "How many bridges connect Manhattan to New Jersey?" not, "How many bridges connect New York City to New Jersey?" Also, the Lincoln and Holland Tunnels connect Manhattan to New Jersey. But, obviously, tunnels aren't the same as bridges.
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brooklyn
Manhatten Island was one of many.
the fact that you have to connect the two bridges and then the beams will need more support in order to stay strong.