You answer is C because 7-(-2) is 9 and then u just had an X at the end .
Hope this helps:)
Answer:
6.24 is a rational number
Step-by-step explanation:
This is because it can be put into a fraction
<u>Given</u>:
The given expression is 
We need to determine the equivalent expression.
<u>Equivalent expression:</u>
Let us determine the equivalent expression.
The equivalent expression can be determined by simplifying the given expression.
Hence, let us apply the exponent rule to simplify the given expression.
Thus, applying the exponent rule,
, we get;

Rewriting the expression, we get;

Simplifying, we get;

Thus, the equivalent expression is 
Hence, Option C is the correct answer.
The answer isn't part of any of the choices that are up there The answer should be 3 Hours and 7 Mins