Locate the absolute extrema of the function (if any exist) over each interval. (If an answer does not exist, enter DNE. ) f(x) = 2x − 6 (a) [−3, 4] minimum (x, y) = ( ) maximum (x, y) = ( ) (b) [−3, 4) minimum (x, y) = ( ) maximum (x, y) = ( ) (c) (−3, 4] minimum (x, y) = ( ) maximum (x, y) = ( ) (d) (−3, 4) minimum (x, y) = ( ) maximum (x, y) = ( )