The answer is C, hope this helps
Maybe 5 multiplying or adding the value of d subtracting 10 equals
Answer: 14.2 - 5a
Work: I just did "CLT" of "Combine Like Terms". I did 8 + 6.2 First because 8 is first, then I did 4a - 9a which is -5a, and I combined them, and got the answer. I hope this helps, and stay safe! :)
None of them are irrational, the definition of an irrational number is a number that cannot be simplified, converted to a fraction, or has no pattern to it or is never ending. For example, a pi is an irrational number because it is never ending and has no pattern to it. Another example would be 0.21411446741354... irrational because it has no pattern to it and cannot be converted to a fraction.
That is 9 hours apart. If you are asking a different question, please list so for us to help. You don't give us any details to help you within this question, and it would be greatly appreciated if you did. Hope I helped :)