Solve. sqrt b^4 /25=4

A. 2
B. 5*sqrt of 2
C. 3
D. 2*sqrt of 5

Starting with the given equation:

sqrt(b^4) / 25 = 4

First, square both sides to get rid of the square root:

b^4 / 25^2 = 4^2
b^4 / 625 = 16

Now, multiply both sides by 625 to get rid of the denominator:

b^4 = 16 * 625
b^4 = 10000

Now take the fourth root of both sides to solve for b:

b = fourth root of 10000
b = 10

So, the correct answer is not listed here. The correct answer is b=10.