Answer
a. no
b. no
c. no
d. yes
e. no
Work Step by Step
(a) 5-1=5; 1-5=-5 ... 5 - 1 $\ne$ 1 - 5
(b) $\frac{1}{5}$=0.2; $\frac{5}{1}$=5 ... $\frac{1}{5}$$\ne$$\frac{5}{1}$
(c) You must put on your socks before you put on your shoes; this cannot be done the other way around.
(d) you can put your hat on before or after putting on your coat; there is no mandatory order
(e) Although not mandatory this is commutative, because to clean your laundry you do not dry and then wash your laundry. This must be done in the sequence of wash then dry.
