Unit 1: Numbers and Quantities
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Questions and Answers

What is the formula to find the surface area of a sphere?

  • 4πr² (correct)
  • πr²
  • 2πr²
  • 3πr²
  • What is the process of finding the original value of an item after a percentage decrease?

  • Inverse proportion
  • Percentage error
  • Percentage increase
  • Solving for the original value (correct)
  • What is the formula to find the volume of a pyramid?

  • ⅓πr²h
  • ⅓bh
  • ⅓lwh (correct)
  • ⅓lwh²
  • What is the process of simplifying an expression involving radicals and exponents using the rules of indices?

    <p>Using the rules of indices</p> Signup and view all the answers

    What is the notation used to represent a set of numbers in set notation?

    <p>Set notation</p> Signup and view all the answers

    What is the primary purpose of a box and whisker plot in data analysis?

    <p>To visualize the spread of a dataset and identify outliers</p> Signup and view all the answers

    A sequence has the formula an = 2n + 1. What is the value of a5?

    <p>13</p> Signup and view all the answers

    A fair six-sided die is rolled. What is the probability of rolling an even number?

    <p>1/2</p> Signup and view all the answers

    A set of exam scores is summarized in the following stem and leaf plot: 3|4 5 6 8 9 9, 4|2 5 7, 5|1 3. What is the median score of the exam?

    <p>47</p> Signup and view all the answers

    Two events, A and B, are independent. If P(A) = 0.4 and P(B) = 0.7, what is the probability of both A and B occurring?

    <p>0.28</p> Signup and view all the answers

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