Use four rectangles to approximate the area of the planar region under the graph of f(x) = 0.2x1.6x² + 19 over the interval [2,7]. Use the left-most endpoints. Round all answers to 3 decimal places, if necessary. x f(x) Sum: Using four rectangles, the approximate area over the interval [2,7] is square units. Enter your answer as an integer or decimal number. Examples: 3,-4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity ok Post to forum