If x and y are positive integers, and x^3*y^4 = 648, which of the following is the value of xy?	Choose one.
A) 2  B) 4  C) 6  D) 8  E) 10
648 = 2^3*3^4   xy = 2*3= 
<gadget id="calculator">2*3</gadget>
<output>6</output>
6   The answer is 6.
<result>C</result>
If x and y are positive integers, and x^3*y^4 = 648, which of the following is the value of xy?