Verified answer

a) [tex]=\frac{15^{4}}{3^{3}*5^{2}*5*5}=\frac{3^{4}*5^{4}}{3^{3}*5^{4}}=3[/tex]

b) [tex]=-(\frac{1}{2})^{3}*10^{4}+\frac{25}{49}*196=-\frac{10000}{8} +25*4=-1250+100=-1150[/tex]