1.Which property justifies each step?

Problem A: 6a + (8b + 2a)

= 6a + (2a + 8b)

2.Which property justifies each step?

Problem A: 6a + (8b + 2a)

= (6a + 2a) +8b

3.Which property justifies each step?

Problem A: (6a + 2a) + 8b

= (6 + 2)a + 8b

4.Which property justifies each step?

Problem A: (6 + 2)a + 8b

= 8a + 8b

5.8a²+ (8a + a²) + 7a

= 8a²+ (a²+ 8a) + 7a

6.Which property justifies each step?

Problem B: 8a²+ (a²+ 8a) + 7a

= (8a²+ a²) + 8a + 7a

7.Combine like terms:

9y²+ 13y²+ 3

8.Combine like terms:

12a²+ 14a - 11a²

9.Combine like terms:

14a²+ 27 + 13a²

10.Combine like terms:

5a + 10b + 7 + 5b

11.Combine like terms:

3(x + 2y) - 2y

12.Combine like terms:

5x + 3(x - y)

13.Write the phrase as a mathematical expression. Use n to represent the number.

Seven times a number, added to the sum of the number and eight

14.Write the phrase as a mathematical expression. Use n to represent the number.

A number multiplied by -7, subtracted from the sum of 11 and three times the number

15.Write the phrase as a mathematical expression. Use n to represent the number.

A number multiplied by 9, added to -8, subtracted from 5 times the number

16.Write the phrase as a mathematical expression. Use n to represent the number.

2 times a number added to -7, added to 6 times the sum of 3 times the number and 8

17.Write the phrase as a mathematical expression. Use n to represent the number.

Seven times a number added to 7, subtracted from triple the sum of six times the number and 7