Year 10 Extension Mathematics Practice Exam

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Questions and Answers

What is the simplified form of $\left( \frac{8}{3} \right)^{-1}$?

  • $\frac{8}{3}^2$
  • $\frac{8}{3}$
  • $\frac{3}{8}$ (correct)
  • $\frac{3}{8}^2$

What is the value of $\sin\left( \frac{3\pi}{2} \right)$?

  • 0
  • Undefined
  • 1
  • -1 (correct)

What is the turning point of the parabola defined by $y = x^2 - 2x - 6$?

  • (1, -8) (correct)
  • (0, -6)
  • (2, -8)
  • (1, -7)

If $3^{x + 1} = 9\sqrt{3}$, what is the value of $x$?

<p>1 (B)</p> Signup and view all the answers

In the equation $x^2 - 2x - 6 = 0$, what are the roots?

<p>$1 \pm \sqrt{7}$ (A)</p> Signup and view all the answers

What materials are students allowed to bring into the examination room?

<p>Pens, pencils, and rulers (D)</p> Signup and view all the answers

Which of the following statements about the examination is true?

<p>Students must not disclose task contents. (D)</p> Signup and view all the answers

How many questions must students answer in this examination?

<p>5 (D)</p> Signup and view all the answers

Which item is specifically excluded from the permitted examination materials?

<p>White out liquid (A)</p> Signup and view all the answers

What is the duration of writing time for the examination?

<p>30 minutes (D)</p> Signup and view all the answers

During Part A of the examination, which of the following is NOT allowed?

<p>Calculators (B)</p> Signup and view all the answers

What type of devices are students prohibited from bringing into the examination room?

<p>Electronic devices that can store information (D)</p> Signup and view all the answers

What should students do if they need to write down their answers?

<p>Use the provided examination space (C)</p> Signup and view all the answers

What should be used to mark answers on the multiple choice answer sheet?

<p>A pencil (C)</p> Signup and view all the answers

What will happen if more than one answer is completed for a question?

<p>No mark will be given (B)</p> Signup and view all the answers

What are the solutions to the equation $8x^2 - 14x + 3 = 0$?

<p>$x = \frac{1}{8},\ x = -\frac{1}{3}$ (C)</p> Signup and view all the answers

Which of the following statements is true regarding incorrect answers?

<p>Marks will not be deducted for incorrect answers (A)</p> Signup and view all the answers

Which expression is equivalent to $4\sqrt{5}$?

<p>$2\sqrt{10}$ (D)</p> Signup and view all the answers

What should you do if you make a mistake on your answer sheet?

<p>Erase the incorrect answer (A)</p> Signup and view all the answers

What are the two possible angles for $∠A$ in triangle ABC, rounded to two decimal places?

<p>33.89° or 146.11° (C)</p> Signup and view all the answers

What does the instruction suggest about shading the box for your answer?

<p>Shade the box completely (B)</p> Signup and view all the answers

Which graph could represent the equation $y = -2^{-x} + 2$?

<p>A graph with a flat top, decreasing from left to right. (C)</p> Signup and view all the answers

Which of the following is NOT a valid property of triangle angles?

<p>All angles in a triangle must be acute. (C)</p> Signup and view all the answers

What is the value of $ ext{cos}(180^ ext{°} + heta)$ when $ ext{cos}( heta) = rac{2}{3}$?

<p>- rac{2}{3} (D)</p> Signup and view all the answers

Which of the following statements about the cosine function is true for $0 \leq \theta \leq 90^ ext{°}$?

<p>Cosine is always positive. (C)</p> Signup and view all the answers

If $\cos(\theta) = \frac{2}{3}$, what is $\theta$ approximately in degrees?

<p>48.19^ ext{°} (B)</p> Signup and view all the answers

In the function $\cos(180^ ext{°} + \theta)$, what type of angle does the addition of $180^ ext{°}$ represent?

<p>An angle in the third quadrant. (B)</p> Signup and view all the answers

Which value would cause $\cos(\theta)$ to be undefined?

<p>90^ ext{°} (C)</p> Signup and view all the answers

If $\theta$ is an angle such that $\cos(\theta) = \frac{2}{3}$, which of the following is true about $\theta$?

<p>$\theta$ is an acute angle. (B)</p> Signup and view all the answers

The cosine of which angle is equal to the negative cosine of another angle in the specified range?

<p>Angle $0^ ext{°}$ compared to $180^ ext{°}$ (B)</p> Signup and view all the answers

What results from evaluating $\cos(180^ ext{°} + \theta)$ if $\theta$ is a positive acute angle?

<p>A negative value. (C)</p> Signup and view all the answers

What is the equation representing the population of the Siamese Fireback after $t$ years?

<p>$P = 800(1 + 0.04)^t$ (A)</p> Signup and view all the answers

What are the x-intercepts of the cubic function that models the tunnel?

<p>(0, 0) and (2, 0) (B)</p> Signup and view all the answers

Which is the correct form of the cubic equation passing through $(0, \frac{9}{5})$?

<p>$y = a(x)(x - 1)^2$ (B)</p> Signup and view all the answers

At what coordinates do the two tunnels intersect?

<p>(1, -2.5) (A)</p> Signup and view all the answers

What does the term 'cubic function' refer to in the context of modeling the tunnel?

<p>A function with a maximum degree of 3 (B)</p> Signup and view all the answers

Flashcards

Examination Rules

Specific guidelines for taking an examination, including allowed and prohibited materials and actions.

CAS Free Exam

Exam where using calculators is disallowed.

Permitted Materials

Items allowed in the examination room.

Prohibited Materials

Items not permitted in the examination room.

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Examination Duration

The time allowed to complete the examination.

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Number of Questions

The total number of questions presented.

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Questions to Answer

The number of questions a student is required to answer.

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Reading Time

Time allocated for reading the examination paper before answering questions.

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Writing Time

Time allowed for completing the exam.

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Exam Structure

Format and organization of the exam.

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Simplifying expressions with positive indices

Rewrite expressions with exponents so that all exponents are positive.

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Multiple Choice Answer Sheet Instructions

Guidelines for completing multiple choice questions on an examination paper.

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Graph Preview (A,C)

A graphic representation of data, likely a visual aid for the examination.

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Completing the square

Rearranging a quadratic expression into a perfect square trinomial by adding and subtracting appropriate terms.

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Factorising a quadratic expression

Expressing a quadratic in the form of the product of two binomials (linear factors).

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Graph Preview (B,D)

Visual aids in an examination. Likely part of visual questions.

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Solving a quadratic equation

Finding the values of 'x' making the equation true.

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Determining the turning point of a parabola

Finding the coordinates of the vertex of a parabola.

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Solving a cubic equation

Finding the values of 'x' that satisfy a cubic equation.

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Solving exponential equations

Finding the value of the variable that makes an exponential equation true.

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Solving logarithmic equations

Finding the value of the variable that makes a logarithmic equation true.

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Exact value of trigonometric functions

Calculating the sine, cosine, or tangent of specific angles without using a calculator, using known values.

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Cosine of 180 + θ

The cosine of 180 degrees plus θ, where θ is an angle between 0 and 90 degrees.

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Trigonometric Function

A function that relates the angles of a right-angled triangle to the ratios of its sides.

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θ (Theta)

A Greek letter representing an angle in a trigonometric context.

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Cos(θ) = 2/3

The cosine of the angle θ is equal to 2/3.

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Quadrant

One of the four sections into which a coordinate plane is divided.

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Solving Quadratic Equations

Finding the values of "x" that satisfy a quadratic equation in the form ax² + bx + c = 0

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Equivalent Expressions (√5)

Expressions that simplify to the same value, like 4√5.

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Finding Triangle Angles

Calculating unknown angles in a triangle, given certain side lengths or angles.

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Graphing Exponential Decay

Representing the relationship of a decreasing exponential function visually

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Siamese Fireback Population Equation

An equation representing the Siamese Fireback population after t years, given an initial population of 800 and a growth rate of 4% per year.

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Tufted Puffin Population Equation

Equation representing the Tufted Puffin population after t years, starting with 300 birds and growing at 15% per year.

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PÅ«teketeke Population Equation

Equation modeling the PÅ«teketeke population (P) over time (t), using initial population (Pâ‚€) and growth constant (k).

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Finding k and Pâ‚€

Determining the growth constant (k) and initial population (Pâ‚€) for the PÅ«teketeke population from given data points.

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Cubic Function x-intercepts

The points where a cubic function crosses the x-axis (y=0) in a graph.

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Cubic Function Equation Form

The form of an equation representing a cubic function, in terms of y=a(x-m)(x-n)²

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Tunnel Intersection Point

The point where the path of the tunnel and the access tunnel meet.

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Study Notes

Year 10 Extension Mathematics Practice Exam

  • Exam Structure: Part A (CAS Free) and Part B (CAS Active)
  • Reading Time: 10 minutes for both parts
  • Writing Time: 30 minutes
  • Part A Structure: 5 questions, 20 marks
  • Part B Structure: 3 questions, 15 marks

Exam Information

  • Permitted Items (Part A): Pens, pencils, highlighters, erasers, sharpeners, rulers, the bound reference, lecture pad of notes

  • Not Permitted Items (Part A): Blank sheets of paper, white out, calculators

  • Permitted Items (Part B): Pens, pencils, highlighters, erasers, sharpeners, rulers, one bound reference, one approved CAS calculator, and (if desired) one scientific calculator

  • Not Permitted Items (Part B): Blank sheets of paper, white out, calculators during reading time, dictionaries

  • General Instructions:

    • Answer all questions in the provided space.
    • Show appropriate working for multi-mark questions.
    • Diagrams are not drawn to scale unless stated otherwise.

Section A Questions (Multiple Choice)

  • Instructions: Answer all questions on a separate answer sheet. Each correct answer is worth 1 mark. Incorrect or multiple answers will not be penalized.

  • Question 1: Finding the value of a in a sinusoidal function with period 5Ï€/2.

  • Question 2: Finding the solutions to a quadratic equation expressed as 8x^2 - 14x + 3=0.

  • Question 3: Determining an equivalent expression to 4√5. (√100, √80, 2√10, √40).

  • Question 4: Finding possible angles for a triangle. Relevant information: Triangle ABC, c=10, a=12, ∠A is unknown.

  • Question 5: Identifying a graph of a function. The function is y = -2^x + 2.

Section B Questions (Extended Response)

  • Instructions: Answer all questions in the provided space. Show all your working. Exact answers are required unless stated otherwise.

  • Question 1 (Part B): Solving a trigonometric equation 8=10 + 4 cos(x) where 0 ≤ x ≤ 2Ï€. Sketching the graph of y = 10 + 4 cos(x) for 0 ≤ x ≤ 2Ï€ (labeling intercepts, endpoints, and turning points).

  • Question 2 (Part B): Two bird populations (Siamese Firebacks and Tufted Puffins) are described. Using equations, determine when the number of Tufted Puffins will exceed the number of Siamese Firebacks. Also, a third bird's population (PÅ«teketeke) P = Po × k^t, is modeled using the different populations/initial population data, find and solve for the constants k and Po.

  • Question 3 (Part B): A tunnel is modeled using a cubic function y = ax^3 + bx^2 + cx + d. Determine the x intercepts. Given the function passes through a point (0,3), determine the equation of the cubic function. Finding the point where two tunnels meet.

Additional Notes

  • Mobile phones and other electronic devices capable of storing, receiving, or transmitting information are not permitted in the examination room.
  • Students are not allowed to disclose the examination contents; doing so is a breach of guidelines.
  • Ensure that all written work is in English.

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