Casio fx-9860GII - 2.5 Graphing a numerical derivative

2. Piecewise functions should always be entered in
the following form:
Equation,[smallest domain value, largest domain value]
3. Enter the first equation by pressing nz5N8
$f+20,L+
([)0,8L-(])
l.
4. Enter the second equation by pressing
nf+23
,L+
([)8,16L-(])l.
5. Enter the third equation by pressing nz1N4
$f+11,L+([)16,20L
-
(])l.
6. Enter the fourth equation by pressing
nz1N2
$f+16,L+
([)20,32L
-
(])l.