ex7
[tex] \: a) \frac{n + 2}{12} = \frac{7}{3} [/tex]
[tex]3 \times (n + 2) = 84[/tex]
[tex]n + 2 = 28[/tex]
[tex]n = 28 - 2[/tex]
[tex]n = 26[/tex]
[tex]b) \frac{7}{2n} = \frac{28}{24} [/tex]
[tex] \frac{7}{2n} = \frac{7}{6} [/tex]
[tex]2n = 6[/tex]
[tex]n = 3[/tex]
ex8
[tex]a)( \frac{3}{2} ) {}^{17} \times ( \frac{3}{2} ) {}^{9} \div ( \frac{3}{2} ) {}^{22} [/tex]
[tex]( \frac{3}{2}) {}^{4} [/tex]
[tex] \frac{81}{16} [/tex]
[tex]b)( \frac{17}{2} ) {}^{13} \times ( \frac{8}{17} ) {}^{13} \div 4 {}^{13} [/tex]
[tex]( \frac{17}{2} \times \frac{8}{17} \div 4) {}^{13} [/tex]
[tex](4 \times \frac{1}{4} ) {}^{13} [/tex]
[tex]1 {}^{13} [/tex]
[tex]1[/tex]
