Which one of the following statements is true about the definite integral 8 x dx -2 O Its value is equal to 14 The area under the graph of y = [x), above the X-axis, and between the lines x = 0 and x = 8 is equal to 30 Its value is equal to 15 The area under the graph of y = |x|, above the X-axis, and between the lines X = -2 and x = 8 is equal to 34 None of these