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[tex]\displaystyle\bf\\4)\\\\\frac{12x^{5} }{25} \cdot\frac{15}{8x^{2} }=\frac{4x^{2} \cdot 3x^{3} \cdot 3\cdot 5}{5\cdot 5\cdot 2\cdot 4x^{2} }=\frac{3x^{3} \cdot 3}{5\cdot 2} =\frac{9x^{3} }{10} \\\\8)\\\\\frac{16x^{5} }{35} \cdot\frac{5}{8x^{3} }=\frac{8x^{3} \cdot 2x^{2} \cdot 5}{5\cdot 7\cdot 8x^{3} } =\frac{2x^{2} }{7} \\\\11)\\\\\frac{18}{c^{4} } \cdot\frac{c^{3} }{24} =\frac{6\cdot 3\cdot c^{3} }{c^{3} \cdot c\cdot 6\cdot 4} =\frac{3}{4c} \\\\12)[/tex]

[tex]\displaystyle\bf\\\frac{3}{4a^{3} } \cdot\frac{16a^{2} }{9} =\frac{3\cdot 4a^{2} \cdot 4}{4a^{2} \cdot a\cdot 3\cdot 3} =\frac{4}{3a}[/tex]