The largest circulations that cover several states at once and are less intense overall are called a. typhoons b. tornadoes c. hurricanes d. mid-latitude cyclones

The answer is C. hurricanes. The largest circulations that cover several states at once and are less intense overall are called hurricanes. They're only called typhoons when they're in the northwest pacific and they're all technically cyclones. 

2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2