Which diagram represents the vector addition c=a+b. which represents vector subtraction c=a-b?

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis.how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

Which of the following is the shape of a cross section of the figure shown below

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?