Provide the proper response.
In defining the definite integral for f(x) on the interval [a,b], we compute Δx =

. If the integral is being used to define area under a curve, then what does Δx represent?
◦ It represents the width of the rectangles used to approximate the area.
◦ It represents the width of the single rectangle used to approximate the area.
◦ It represents the height of the rectangle used to approximate the area.
◦ None of these