You just need to match the terms that are the same. Let's look at number one. 2x^2 + 4x +1 + 3x^2 +6x +5 the matching parts: the 2x^2 and the 3x^2 go together. That means you can combine them here they are positive so you add them. The 4x and the 6x go together they both only have an x with them. They are both positive so you can add them together. Last you have a 1 and a 5. These are matching so you can combine them too. They are both positive too so just add them together. So your final answer would be 5x^2 + 10x + 6. Does that make sense?
So first simplify 11/6x into 11x/6. Then -13/10x into -13x/10. So you should now have (-13x/10-11x/4)-3/2. Combine the like terms -13x/10 and -11x/4 to get -81x/20 and then with your left over -3/2= -81x/20-3/2
