Can someone help with this question?

Which of those sequences is a geometric sequence

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )