Question 28, 30, 38, and 40. If possible please explain.

17. [8]+16] in 7in 18. [91+[11] in Zi. 19. 15t+{10 ie Zi 20. 9+8 in Z is 21. [23]+[15] in 2 22. 1121+[241 in 21 23.[16]+[9] in 2 24. [43]+3]] in 2 m 25. 8I7 in Z. 26. {y][3] in 2. 27. [4]1I] in 7. 24. 1320) in Z11 25. [5)12] in 8 . 34. [8I[11] in Z. 31. [9/6 in z 32. [16] 3] in 2 : 33. {9]2 in 2 ? 34. [III" in Z3 3 131)3 an Z+ 36. 11.7 in Z1 37. A lewapaper iefecypecariter that is in content operation uses four fect of paper per hour. If a hew inil of papet P0e fevt fong is installed at 6:00rm. at whal bour of the day will the mactune rua cet of paper? 35. A hospital heart inonitoring davice uses twe feet of paper per bow. If it is attached to a patient if 8.00 A. 4 . with is supply of poper 150 feer long, at what hour of the day in ill ile device run eut of paper? 39. Uxe Fxample 3.2 to determine the correct check digit for the ISBN that has 3.540 - 905 lis avits firt nime digits. 41. The Linivernal Prodact Code (UPC) is a 12-digit number found on products thas enables them wo sdewifind by clectroeic seanning devices. The first sit digats identify the coanty of otigit and the manulacture, the: next tive digits indicate the product, and the last digis is a chock digit, If the first eleven diegits of a UPC are af . di. ..... Hi1, then the check digit of is chosen wo that 0ai4