What is the answer? i also don't understand this

We need to simplify this number.  We begin by evaluating the numbers inside the equation.  We can simplify this to:



Now, we evaluate this one step further.  Because a negative exponent makes the number 1 over what it was, we can make this problem:



This becomes:



So, 1/4k is the answer.  This is the same as C, so C is the right answer.

X> -2 is the simplified version.