End of Unit 6 Review-7th grade

Lin got a $50 gift card to an online music store. She uses the gift card to buy an album for $12.00. She also wants to use the gift card to buy some songs. Each song costs $1.29.

Which of these inequalities describes this situation, where x is the number of songs Lin wants to buy?

• 12.00+1.29n ≥ 50

• 12.00+1.29n < 50

• 12.00 - 1.29n < 50

• 12.00 - 1.29n > 50

Which number line shows all the values of x that makes the inequality -3x + 1 > 7 true?

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Select all expressions that are equivalent to

5x + 1 − (3x − 1).

• 5x + 1 − 3x − 1

• 5x + −3x + 1 + 1

• 2x + 2

• 5x + 1 + −3x − −1

• 5x − 3x + 1 − 1

What is the mistake?

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• The mistake is that 4x + 9x is not 13x

• You cannot add 4x and 9x because they are not like terms.

• 6-2x + 5 + 4x is not equal to (6 - 2)x + (5 + 4)x in the second step.

• He did not use the correct order of operations.

Kyle rented 1 pair of skates and played 3 video games for a total of $11.50. The skates costs $4.75 to rent. The video games cost the same amount each to play. What amount, in dollars, did Kyle pay to play each game?

Which expression is equivalent to 2a+4b+4b+5a+17?

• 32ab

• 15ab+17

• 6a+9b+17

• 7a+8b+17

 $12-\frac{16}{3}x\ +\frac{1}{3}\ x$ 
Which expressions are equivalent?

• 7x

• 12-5x

• -5(x + 2.4)

• 5(-2.4 + x)

• -5(x-2.4)

-5 - (-7)

If both integers are negative their sum is

• positive

• negative

• depends on which number has the larger absolute value.

Which graph represents the inequality x < 23 ?

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