LEED BD+C Help

Hi everyone, Currently racking my brains over the BD+C reference guide and can't seem to locate the answers to a few questions I have regarding BD+C rating system, if anyone can help with ANY of these inquiries, it would be much appreciated! --For Credit SS 5.1 and SS 5.2 may only one exemplary performance credit be earned between these credits? How about for SS 7.1 and SS 7.2? (Since Credit 4 has a 1 EP limit between SS 4.1-4.4) --Not understanding Development Density Exemplary performance requirement- if a project's density is 120,000 sq ft does it automatically receive +1 EP? --To determine average weighted roof compliant area, are you adding or multiplying [(Area meeting min SRI/.75)+ (vegetated roof area/.5)] The reference guide clearly states you must multiply, however I came across a solution for a GBES question which adds both values! --Lets say you are calculating the amount of open space needed to qualify for the Maximize Open Space credit. You are given 20 acres with a local zoning requirement of 4 acres of open space. The project has restored 2 acres of land with native and adaptive plants. The project also has a vegetated pond that takes up .5 acres. The BD+C rule states I must exceed local zoning requirement by 25%, making it 5 acres total of open space that I need. Must I subtract 2 AND .5 Acres from 5 acres to determine how many MORE acres of open space are needed for this credit? THANK YOU for any help!