Solve the following arithmetic problems: Row 1: 17-3, 14+3, 39-10, 12+24, 86-58 Row 2: 139-110, 237+213, 325-204, 474-136 Row 3: 642-413, 49+20, 135+146

• For $17 - 3$: $$17 - 3 = 14$$
• For $14 + 3$: $$14 + 3 = 17$$
• For $39 - 10$: $$39 - 10 = 29$$
• For $12 + 24$: $$12 + 24 = 36$$
• For $86 - 58$: $$86 - 58 = 28$$

• For $139 - 110$: $$139 - 110 = 29$$
• For $237 + 213$: $$237 + 213 = 450$$
• For $325 - 204$: $$325 - 204 = 121$$
• For $474 - 136$: $$474 - 136 = 338$$

• For $642 - 413$: $$642 - 413 = 229$$
• For $49 + 20$: $$49 + 20 = 69$$
• For $135 + 146$: $$135 + 146 = 281$$

The completed answers are:

• $17 - 3 = \boxed{14}$
• $14 + 3 = \boxed{17}$
• $39 - 10 = \boxed{29}$
• $12 + 24 = \boxed{36}$
• $86 - 58 = \boxed{28}$
• $139 - 110 = \boxed{29}$
• $237 + 213 = \boxed{450}$
• $325 - 204 = \boxed{121}$
• $474 - 136 = \boxed{338}$
• $642 - 413 = \boxed{229}$
• $49 + 20 = \boxed{69}$
• $135 + 146 = \boxed{281}$