Calculate 7+3
If 5+3=158, 9+1=910, 8+6=4814, 4+4=168 then 7+3=?Correct answers: 308
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World's first rocket-propelled aircraft flightIn 1928, the world's first rocket-propelled aircraft flight was made over the Rhon Mountains, Germany. It was a tailless glider with two solid-fuel rockets, pioneered and developed by Alexander Martin Lippisch. |