m 1 1 1 1 - = + + _+ I I u - - - 11.10. For n 6 estimate the sum to :21 k3\": + l) 2 12 36 using the midpoint approximation and determine how many decimal places to use in the estimate. 1 HELP: x2[x+l} a = E + 2 + L [partial fraction expansion} from Ch. 14 I I 1+1