7. [2/8 Points] DETAILS PREVIOUS ANSWERS LARCALC11 5.4.082. MY NOTES The figure below shows the graphs of f and g, where a is a positive real number. Identify the open interval(s) on which the given conditions hold for the graphs of f and g. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) g(x)=e-ex (a) f is increasing Dne X f is decreasing Dne g is increasing Dne g is decreasing One X (b) fis concave upward f is concave downward g is concave upward