Open Up - Grade 7 - Mathematics - Unit 6 - Lesson 21
By Formative Library
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Last updated over 2 years ago
8 Questions
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1.
- Noah says that9x - 2x + 4x is equivalent to 3x , because the subtraction sign tells us to subtract everything that comes after 9x.
- Elena says that 9x - 2x + 4x is equivalent to 11x, because the subtraction only applies to 2x .
Do you agree with either of them?
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2.
Identify the error in generating an expression equivalent to 4 + 2x - \frac{1}{2}(10 - 4x). Then correct the error.
4 + 2x + \frac{-1}{2}(10 - 4x).
4 + 2x -5 + 2x.
-1
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3.
Select all expressions that are equivalent to 5x - 15 - 20x +10.
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4.
The school marching band has a budget of up to $750 to cover 15 new uniforms and competition fees that total $300. How much can they spend for one uniform?
Write an inequality to represent this situation.
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5.
The school marching band has a budget of up to $750 to cover 15 new uniforms and competition fees that total $300. How much can they spend for one uniform?
Solve the inequality and describe what it means in the situation.
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6.
Solve the inequality that represents each story.
For every $9 that Elena earns, she gives x dollars to charity. This happens 7 times this month. Elena wants to be sure she keeps at least $42 from this month’s earnings.
7(9 - x)\ge 42
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7.
Solve the inequality that represents each story.
Lin buys a candle that is 9 inches tall and burns down x inches per minute. She wants to let the candle burn for 7 minutes until it is less than 6 inches tall.
9 - 7x < 6
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8.
A certain shade of blue paint is made by mixing 1\frac{1}{2} quarts of blue paint with 5 quarts of white paint. If you need a total of 16.25 gallons of this shade of blue paint, how much of each color should you mix?
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