Explain how (13 + 10) + 5 is solved differently from 13 + (10 + 5). a) for (13 + 10) + 5, you add 13 + 5 first, then add 10. for 13 + (10 + 5), you add the 10 + 13 first, then add 5. b) for (13 + 10) + 5, you add 13 + 10 first, then add 5. for 13 + (10 + 5), you add the 10 + 5 first, then add 13. c) for (13 + 10) + 5, you add 13 - 10 first, then add 5. for 13 + (10 + 5), you add the 10 - 5 first, then add 13. d) for (13 + 10) + 5, you add 13 + 10 first, then subtract 5. for 13 + (10 + 5), you add the 10 + 5 first, then subtract 13.