PA Keystone Questions 21-22

Four expressions are shown below.

√ x x^2 1/ x x/ 2

Which inequality comparing two of the expressions is true when 0.1 ≤ x ≤ 0.4?

• √ x > x^2

• x^2 > x /2

• x > 1/ x

• x /2 > 1/ x

The greatest common factor (GCF) of x^3y^k and x^(2k)y^4 is x^3y^3. What is the value of k?

• 1

• 2

• 3

• 4

Which equation correctly shows that (x^2) ^4 = x^8?

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When factored completely, which is a factor of 6x^3 – 12x^2 – 48x?

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Anna’s Bakery charges a delivery fee of $10.95 for one delivery order of cupcakes. Each cupcake in the order costs $1.15. Which equation describes the relationship between the number of cupcakes ordered (x) and the total cost (y), in dollars, of the delivery order?

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Kylie and Rhoda are solving the equation 4(x – 8) = 7(x – 4). • Kylie uses a first step that results in 4x – 32 = 7x – 28. • Rhoda uses a first step that results in 4x – 8 = 7x – 4. Which statement about the first steps Kylie and Rhoda use is true?

• Kylie uses the associative property, resulting in a correct first step.

• Kylie uses the distributive property, resulting in a correct first step.

• Rhoda uses the associative property, resulting in a correct first step.

• Rhoda uses the distributive property, resulting in a correct first step.

Darlene is collecting prize tickets. The equation y = 2x + 1 describes the relationship between the number of days (x) since she began collecting and the number of prize tickets (y) she has collected. Which statement correctly describes a solution of the equation?

• Darlene has collected 2 prize tickets at the end of 1 day.

• Darlene has collected 4 prize tickets at the end of 9 days.

• Darlene has collected 22 prize tickets at the end of 10 days.

• Darlene has collected 25 prize tickets at the end of 12 days.

Mary measured the heights of two different plants every day. Plant A was 1 inch tall when Mary began her measuring, and it grew 0.5 inch per day. Plant B was 3 inches tall, and it grew 0.25 inch per day. On which day were plant A and plant B the same height?

• day 5

• day 8

• day 12

• day 12

Which graph shows the solution set of the inequality |2x – 7| > 3?  

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The solution set of an inequality is shown to the left.

Which inequality has the solution set shown in the graph?

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