He's really tall.

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6

a,\(\dfrac{3}{4}+2\)
 \(=\dfrac{3}{4}+\dfrac{8}{4}\)\(=\dfrac{11}{4}\)
b,\(\dfrac{2}{3}-\dfrac{3}{8}\)
\(=\dfrac{16}{24}-\dfrac{9}{24}=\dfrac{7}{24}\)
c,\(\dfrac{2}{9}\)x\(\dfrac{3}{8}\)
=\(\dfrac{1}{12}\)
d,18:\(\dfrac{2}{3}\)
=\(\dfrac{18}{1}\)x\(\dfrac{3}{2}\)=\(27\)

\(\dfrac{5}{6}:x=\dfrac{1}{6}-\dfrac{4}{5}\)
\(\dfrac{5}{6}:x=-\dfrac{19}{30}\)
      \(x=\dfrac{5}{6}:\left(-\dfrac{19}{30}\right)\)
      \(x=-\dfrac{25}{19}\)

\(\dfrac{8}{9}\)<\(\dfrac{4}{3}\)<\(\dfrac{5}{3}\)<\(\dfrac{7}{7}\)