Question 579079
64 = 4^3



So 


(64^7/9)/(4^3/4) = (4^(3*7/9))/(4^3/4)


(64^7/9)/(4^3/4) = (4^(21/9))/(4^3/4)


(64^7/9)/(4^3/4) = 4^(21/9- 3/4)


(64^7/9)/(4^3/4) = 4^(19/12)


(64^7/9)/(4^3/4) = 8.979696 ... Note: Use a calculator on this step.