Final answer:
The square root of 16x^3y^6 is equal to 4 when x=0 and y=0.
Step-by-step explanation:
To find the square root of 16x^3y^6, we can substitute x=0 and y=0 into the expression. This simplifies the expression to sqrt(16*0^3*0^6). Since any number raised to the power of 0 is equal to 1, the expression becomes sqrt(16*1*1). This simplifies further to sqrt(16), which is equal to 4.
Therefore, the correct answer is
(b) 4
.