Answer
(a) See graph.
(b) February, 26 inch.
(c) February.
Work Step by Step
(a) See graph.
(b) The deepest snow will have the highest vertical reading in the graph, $f(4)=26$, thus in it happens in February with a depth of 26 inch.
(c) The snow begins to end when the snow stops accumulating, which happens when $x= 4$ or in February.
