a)
[tex]2(4 \frac{1}{3} + 7 \frac{1}{5} ) = 2(4 \frac{5}{15} + 7 \frac{3}{15} ) = 2( 11\frac{8}{15}) = 2 \times 11 \frac{8}{15} = 22 \frac{16}{15} = 23 \frac{1}{15} cm[/tex]
b)
[tex]2(3 \frac{2}{7} + 1 \frac{1}{5} ) = 2(3 \frac{10}{35} + 1 \frac{7}{35} ) = 2(4 \frac{17}{35} ) = 2 \times 4 \frac{17}{35} = 8 \frac{34}{35} cm[/tex]
c)
[tex]2(2 \frac{3}{4} + 1 \frac{5}{8} ) = 2(2 \frac{6}{8} + 1 \frac{5}{8} ) = 2(3 \frac{11}{8} ) = 2 \times 3 \frac{11}{8} = 6 \frac{22}{8} = 8 \frac{6}{8} = 8 \frac{3}{4} cm[/tex]
