Choose the correct options for the following questions.
If $a\:\epsilon\:R$, then the additive inverse of a is
Difficulty: Hard
A:
$\frac{1}{a}$
B:
$-\frac{1}{a}$
C:
a
D:
-a
The identity element with respect to subtraction is
Difficulty: Hard
A:
0
B:
-1
C:
0 and 1
D:
None
If a and b are real numbers then a+b is also real number this law is called
Difficulty: Easy
A:
Associative law of addition
B:
Closure law of addition
C:
Distributive law of addition
D:
Commutative law of addition
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