Concept:The series alternates between multiplying by 2 and subtracting 2.Explanation:Start with 5. Multiply by 2 to get 10. Subtract 2 from 10 to get 8. Multiply 8 by 2 to get 16. Subtract 2 from 16 to get 14. Then multiply 14 by 2 to get the next number: 28.