Class VII

When numbers/literals are added or subtracted, they are called _________.
  1. Expressions
  2. Identities
  3. Terms
  4. None of these
-b - 0 is equal to
  1. -1 * b
  2. 1 - b - 0
  3. 0 - (-1) * b
  4. -b - 0 - 1
The side length of the top of square table is a, then the expression for its perimeter is
  1. 4 + a
  2. 2a
  3. 4a
  4. 8a
Expressions consists of _____________ and _______________.
  1. Expressions
  2. Identities
  3. Variables , constants
  4. None of these
Addition of 3ab, -5ab, 8ab and -4ab is
  1. ab
  2. 2ab
  3. 3ab
  4. 4ab
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