Can someone answer this for me. step by step explanation included

Plzzz plzz maths ! quadratic sequences =an^2+bn 1) 1,6,15,28,45 2)5,18,39,68,105 3) 1,8,21,40,65 4) 7,24,51,88,135 5) -1,2,9,20,35

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers