Challenge...

If...
2 + 3 = 10
7 + 2 = 63
6 + 5 = 66
8 + 4 = 96

what does 9 + 7 = ????


a math challenge given to me via email. the answer was the code to open an excel file with names of everyone who solved it. decently impressive. i needed a break from homework, this is what i do....