Title: Math 7 Combine Like Terms
Course: quiz duplicate error

Q: Identify the coefficient of the term.

-4y
- y (Incorrect. The coefficient is the number multiplied to the y.)
- 4y (incorrect)
- -4 (correct)
- 4 (incorrect)
A: -4

Q: Identify the coefficient of the term.

d
- d (Incorrect. The coefficient is the number multiplied to the d. What times d is d?)
- 1 (correct)
- 0 (If it were 0d, then the d wouldn't show up. How many d are there?)
- -1 (incorrect)
A: 1

Q: Determine whether all the terms are like or unlike.

12m, 11m, -6m
- like (correct)
- unlike (incorrect)
A: like

Q: Determine whether all the terms are like or unlike.

5, 4, -7
- like (correct)
- unlike (All three of these are constants with no variables, so they are like terms.)
A: like

Q: Determine whether all the terms are like or unlike.

2b, 11, 8a
- like (incorrect)
- unlike (correct)
A: unlike

Q: Determine whether the terms are like or unlike.

6a^3, 6a^2
- like (These both have a, but because one is a to the 3rd power and one is a to the second power, they are not like terms.)
- unlike (correct)
A: unlike

Q: Simplify the expression by combining like terms.

4b - 2b
- 2b^2 (incorrect)
- -2b (incorrect)
- -6b (incorrect)
- 2b (correct)
A: 2b

Q: Simplify the expression by combining like terms.

3x - 7x - x
- -5x (correct)
- -4x - x (You can still add the -4x and the -1x.)
- -3x (After you do 3x - 7x = -4x, then you still need to subtract x.)
- -4x (incorrect)
A: -5x
Partly right: -4x - x (50%)

Q: Simplify the expression by combining like terms.

8a - 2a - a - 12
- 6a - 12 (incorrect)
- 5a - 12 (correct)
- 6a - a - 12 (You haven't finished simplifying. You can still add 6a and -1a)
- 6a - 13 (-a is -1a. Add it to the a terms, not to the -12.)
A: 5a - 12
Partly right: 6a - a - 12 (50%)

Q: Simplify the expression by combining like terms.

3x - 5
- -2x (You cannot add x's and ones. They are not like terms.)
- -2 (You cannot add x's and ones. They are not like terms.)
- -8x (You cannot add x's and ones. They are not like terms.)
- Cannot be simplified (correct)
A: Cannot be simplified

Q: Simplify the expression by combining like terms.

7b - 2b + 5
- -5b + 5 (The 7b was positive.)
- 10b (incorrect)
- 5b + 5 (correct)
- 9b + 5 (incorrect)
A: 5b + 5

Q: Simplify the expression by combining like terms.

7x - 12x + x
- -4x (correct)
- -5x + x (You haven't finished simplifying. You can still add 1x to -5x.)
- -6x (7x - 12x will be -5x and then you need to add 1x.)
- -5x (7x - 12x will be -5x and then you need to add 1x.)
A: -4x
Partly right: -5x + x (50%)

Q: Simplify the expression by combining like terms.

6x + 3 - 4x + 2
- 7 (You can't add x's and ones together.)
- 2x + 5 (correct)
- 7x (You can't add x's and ones together.)
- 10x + 5 (Close! There is a negative on the 4x.)
A: 2x + 5

Q: Simplify the expression by combining like terms.

1.3y - 8 + 7y + 1
- 9.1y - 8 (Add the 1.3y and the 7y, then add the -8 and the 1.)
- 1.3 (Add the 1.3y and the 7y, then add the -8 and the 1.)
- 1.3y + 7y - 8 + 1 (You can still add the y's together and the ones together.)
- 8.3y - 7 (correct)
A: 8.3y - 7

Q: Simplify the expression by combining like terms.

8a - 3a + a - 10
- 5a - 10 (8a - 3a = 5a, and then you still need to add the 1a)
- 6a - 10 (correct)
- 5a + a - 10 (You haven't finished simplifying. You can still add 5a and 1a.)
- 5a - 9 (incorrect)
A: 6a - 10
Partly right: 5a + a - 10 (50%)

Q: Simplify the expression by combining like terms.

9b - 6b + 3
- -3b + 3 (9b - 6b = 3b)
- 6b (9b - 6b = 3b)
- 3b + 3 (correct)
- 15b + 3 (9b - 6b = 3b)
A: 3b + 3

Q: Simplify the expression by combining like terms.

5.8k - 1.1 - 3.6k + 2 + 2.8k
- 12.2k + 0.9 (There is a negative on the 3.6k)
- 5k + 0.9 (correct)
- 5k - 0.9 (Incorrect. The 2 was positive.)
- 5k + 3.1 (There is a negative on the 1.1)
A: 5k + 0.9

Q: Simplify the expression by combining like terms.

-8y + 1 - 4 + 7 + y - 4
- -9y (incorrect)
- -9y + 1 (incorrect)
- -7y - 1 (Look at the constants again. You have 1 - 4 + 7 - 4.)
- -7y (correct)
A: -7y

Q: Simplify the expression by combining like terms.

-2x^2 + 9x^2
- -11x^2 (You need to add -2 + 9)
- 7x^4 (The x^2 terms are like terms. Just add their coefficients and leave them x^2.)
- 7x^2 (correct)
- Cannot be simplified (incorrect)
A: 7x^2

Q: Simplify the expression by combining like terms.

-3x + 1 - 4y + 2x + y - 4
- -7xy (incorrect)
- -5y - 5x - 3 (incorrect)
- -7y (incorrect)
- -x - 3y - 3 (correct)
A: -x - 3y - 3