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a+ (n-1)b + a +(n-1)b = 110
2+ (7-1)b +29 +(8-1)b =110
29 +6b+29+7b=110
13b=110-58
b=52/13= 4
1. U10 = a+(n-1)b = 29+(10-1)4 = 29+9.4 = 29+36 =65
2. S10 = n/2 (2a+(n-1)b) = 10/2 ( 2x 29 +(10-1)4 = 5 (58+36) = 5 (94) =470