Taxi Cab: Ask the user for the number of people that need a taxi cab. Find the number of trips for the taxi cab, not including the trips without passengers. Also, find the number of passengers on the last trip.
Scalene Triangle: Ask the user for the lengths of a triangle. Use a validation loop. If one entry is negative, ask for another entry that's positive. Determine if the given lengths form a triangle: the sum of two sides must be greater than the third side. Finally, determine if the triangle is scalene, i.e., if all sides are different.
