A(n) is the set of possible values for a given attribute

Answer the questions in the attachment. a rescue helicopter is at point a and a rescue boat is at point e. the helicopter pilot spots boats in distress at points d and c,with angles as marked in the diagram. figure abce is a rectangle. the altitude of the rescue helicopter, represented by ae, is 5000 feet.

Can someone me out here and the tell me the greatest common factor

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)