56. Snow Depth The snow depth in Michigan's Isle Royale National Park varies-
throughout the winter. In a typical winter, the snow depth in inches is approximated
by the following function.
f(x) =
6.5x if 0 ≤ x ≤ 4
-5.5x + 48 if 4 < x≤ 6
-30x + 195 if 6 < x≤ 6.5
Here, x represents the time in months with x = 0 representing the beginning of
October, x = 1 representing the beginning of November, and so on.

(a) Graph y = f(x).
(b) In what month is the snow deepest? What is the deepest snow depth?
art
(c) In what months does the snow begin and end?