please help me to solve the problem especially (d) in steps!!

10, 20, 30 40 [1 3 4 8 12 15 22 27 32 33 35 38 41 42 43 46 47 a) Insert key 13. b) Based on output from step a), insert key 37. c) Based on output from step b), insert key 34. d) Based on output from step c), insert key 45