c] [tex]\frac{4\cdot(-\frac{1}{8} )}{15}=-\frac{\frac{1}{2} }{15}=-\frac{1}{2}\cdot\frac{1}{15} =-\frac{1}{30}[/tex]
d] [tex]3\cdot(\frac{1}{2})^2+5\cdot\frac{1}{2}=3\cdot\frac{1}{8}+\frac{5}{2}=\frac{3}{8}+ \frac{20}{8} =\frac{23}{8}=2\frac{7}{8}[/tex]
