What is the value of 3/4 k to the 3rd power -9 when k=3

So, I am assuming your problem looks like this: (3k/4)^3

If that is true, then simply substitute 3 in for k so you get: [3(3)/4]^3

That is equal to (9/4)^3 which is equal to (9/4)(9/4)(9/4) = (729/64)

So your answer is 729/64 or 11.390625

-6 is the correct option from the above given options

square root of 36/6 = 2.449489743

square root of 16/6 = 1.632993162

square root of 6 = 2.449489743

the answer is square root of 16/6 because the square root of 36/6 is the same answer as square root of 6 = 2.449489743