use calculator Let . R be the region in the first quadrant bounded by the graph of y =4-x , the x-axis and the y-axis. Determine the value of k such that the vertical line x =k cuts the region R into two smaller regions whose areas are equal. (A) 0.520 (B) 0.695 (C) 0.875 (D) 1.000 (E) 1.135