Identities and properties

Exercise and reference answers

Questions

1. Question

   The additive identity for rational numbers is

   Choices

   1. 1
   2. −1
   3. 0

   Correct choice

   0

2. Question

   The multiplicative identity is

   Choices

   1. 1
   2. 0
   3. 10

   Correct choice

   1

3. Question

   a(b + c) = ab + ac is called

   Choices

   1. closure
   2. distributivity
   3. commutativity

   Correct choice

   distributivity

4. Question

   a + b = b + a shows

   Choices

   1. associativity
   2. closure
   3. commutativity

   Correct choice

   commutativity

Explanation