I need help on how to do questions with proof.

1. On a day in January, the temperature in the Etosha National Park, Namibia reached a high of 35oC and a low of 16oC. What is the difference in temperature in degrees Fahrenheit (to the nearest tenth of a degree)? 2. A bridge known as the "Can Opener" is located in Durham, North Carolina at Peabody and Gregson streets. The bridge has a reputation of "decapitating" vehicles that are too tall to clear the underpass. The bridge has a clearance (roadway to the bottom of the bridge) of 11 feet and 8 inches (11'-8"). Your moving van is 23 feet and 11 inches long (23'-11") and 16.5 inches from road to axles and 3.1 meters from the axles to the top of the vehicle. Will you make it safely under the bridge? Prove it (show your evidence)! 3. An ocean shipping route from Singapore to Haiphong, Vietnam is 1325 nautical miles. A nautical mile (nm) is 1.1508 statute (standard) miles. How many statute (standard) miles is this shipping route (to the nearest mile)? How many kilometers (to the nearest Km)? 4. The container ship Emma Maersk, owned by A.P. Moller-Maersk Group of Denmark is travelling from Copenhagen to the Port of Keflavik, Iceland. The nautical distance between the two locations is 1444 nautical mile (nm). (1 nm = 1.1508 miles). If the Emma is averaging a speed of 22 knots (kt), assuming no delays, how long will it take the ship to make the journey? Report your answer in days, hours, minutes (DD:HH:MM). 1kt = 1 nm/hr.