Gov. Andrew Cuomo is set to open on Thursday the first span of the new Thruway bridge over the Hudson River, known as the Tappan Zee Bridge and to be renamed the Gov. Mario Cuomo Bridge. But questions still linger over how, ultimately, the bridge will be paid for. Cuomo has been reluctant to divulge details on how the tolls on the bridge will be affected after the multi-billion-dollar project to replace the over three-mile-long span is completed. Part of the estimated $4 billion project has been financed through one-time payments from banks as part of settlements after the financial crisis. There’s a $1.6 billion federal loan, and the Thruway Authority has taken out about three-quarters of a billion dollars in bonds.