For any two integers a and b, which of the following suggests that the operation of addition is commutative?

1. a × b = b × a

2. a + b = b + a

3. a − b = b − a

4. a + b > a

The number of unlike terms in the expression

2x²y − 3y²z − 5yx² + yz(x + y) + 7 is

1. 3

2. 4

3. 5

4. 6

Statement I: The number of terms in the expression x + 2y + y is 3.

Statement II: 3x + 4 = 0 is a linear equation.

1. Statement I is true but statement II is false.

2. Statement I is false but statement II is true.

3. Both Statement I and statement II are true.

4. Both Statement I and statement II are false.

Statement I: If John's present age is x years, then five less than double his age is (2x − 5) years.

Statement II: 3x × 4y is an algebraic expression with only one term.

1. Statement I is true but statement II is false.

2. Statement I is false but statement II is true.

3. Both Statement I and statement II are true.

4. Both Statement I and statement II are false.