Algebra question plz how can you write the expression with a rationalized denominator ? my answer was b but i'm not sure if i'm right

We rationalize fractions in order to remove square roots from the denominator. To do so, we must multiply the numerator and denominator by the same value. 

In this case, we can multiply by  which will cancel out the cube root, leaving the denominator as 4.



The result is:



This can be reduced by pulling an 8 out from the radicand:



Furthermore:



The last option is the correct answer.

I’m guessing that the answer is c, but i’m not sure which grid is being talked about. since 5x5= 25 and 3x3= 9 (which there are no answers for). a is not right because while the ratio is the same, 6/25= 0.24 which is equal to 24% not 30%.