1)What is C dx, x=a,b where C is a constant?

1)What is ∫ C dx, x=a,b where C is a constant? 2)Suppose F'(x) = g(x). Imagine a graph of g(x), for x from c1 to c2. The area between the curve and the x-axis is A(c1,c2). (A) Express A(c1,c2) in terms of g. (B) Express A(c1,c2) in terms of F.