The function d(s) = –5s – 15 models the depth, in feet, of a rock that dante dropped into a lake s seconds after he lost sight of the rock. what is the meaning of the x-intercept? question 4 options: a)dante lost sight of the rock when it was 15 ft below the lake’s surface. b)dante saw the rock for 15 s before losing sight of it. c)dante lost sight of the rock when it was 3 ft below the lake’s surface. d)dante saw the rock for 3 s before losing sight of it.