Answer :
We will have that the common denominators are:
[tex]\frac{3}{4}+\frac{1}{8}=\frac{3\cdot8}{4\cdot8}+\frac{1\cdot4}{8\cdot4}=\frac{24}{32}+\frac{4}{32}[/tex][tex]=\frac{28}{32}=\frac{7}{8}[/tex]So, the common denominator is 32.
We will have that the common denominators are:
[tex]\frac{3}{4}+\frac{1}{8}=\frac{3\cdot8}{4\cdot8}+\frac{1\cdot4}{8\cdot4}=\frac{24}{32}+\frac{4}{32}[/tex][tex]=\frac{28}{32}=\frac{7}{8}[/tex]So, the common denominator is 32.