a) \( 6\left(\frac{1}{2}+\frac{1}{3}\right) \) c) \( 12(13-8)-11(22-17) \)
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To solve \( 6\left(\frac{1}{2}+\frac{1}{3}\right) \), first find a common denominator for the fractions. The least common multiple of 2 and 3 is 6. Thus, convert \(\frac{1}{2}=\frac{3}{6}\) and \(\frac{1}{3}=\frac{2}{6}\). Adding them gives \(\frac{3+2}{6}=\frac{5}{6}\). Now multiplying by 6 results in \(6 \times \frac{5}{6} = 5\). For \( 12(13-8)-11(22-17) \), start by simplifying the parentheses. \(13-8=5\) and \(22-17=5\). Therefore, you have \(12 \times 5 - 11 \times 5\), which simplifies to \(60 - 55 = 5\). So, you get the final answer for both parts as \(5\).