<span>1. 0.5 is greater, 2. A + 13c is greater, 3. the expressions are equal, 4. there is not enough information available — it depends how much greater a is than b, 5. The expressions are equal.</span>
Factoring the polynomial
by grouping means separation of the polynomial in two addends, each of them consists of two addends:
In first brackets the common factor is
in second brackets the common factor is 
Then

Answer: correct choice is B