Find the area (in unit2) between the x-axis and the graph of f over the interval [-2, 2] using rectangles. For the rectangles, use squares 0.8 by 0.8 units, and approximate both above and below the lines. above 6.4 unit below 3.84 unit2 Use geometry to find the exact answer (in unit2). 2 units Consider the function f(x)=4x. (Hint: This is the upper half of a circle of radius 2 positioned at (0, 0).) Sketch the graph of f over the interval [-2, 2].