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Capstone Feb 23 - Mar 1 25 questions
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Monday 23 February 2026

Keystones #54 · Five questions · Open this day only

  1. 1. Number

    79 is rounded to the nearest integer. What is the error interval?

    Answer: 78.5 ≤ x < 79.5
  2. 2. Algebra

    Solve: 2x + 3y = 26 and 3x - y = 17

    Answer: x = 7, y = 4
  3. 3. Geometry

    Find the distance between (-8, 2) and (6, 10)

    Answer: 16.12
  4. 4. Ratio

    A car worth £7,661.00 depreciates by 23% each year for 5 years. What is it worth after 5 years?

    Answer: £2,073.67
  5. 5. Statistics

    A bag has 5 red out of 11 balls. If you pick 74 times (with replacement), how many times would you expect red?

    Answer: 33.6

Tuesday 24 February 2026

Keystones #55 · Five questions · Open this day only

  1. 1. Number

    51 is rounded to the nearest integer. What is the error interval?

    Answer: 50.5 ≤ x < 51.5
  2. 2. Algebra

    Solve: 2x + 3y = 24 and 3x - y = 14

    Answer: x = 6, y = 4
  3. 3. Geometry

    Find the distance between (-8, -3) and (3, 10)

    Answer: 17.03
  4. 4. Ratio

    A car worth £19,293.00 depreciates by 19% each year for 5 years. What is it worth after 5 years?

    Answer: £6,727.05
  5. 5. Statistics

    A bag has 4 red out of 11 balls. If you pick 114 times (with replacement), how many times would you expect red?

    Answer: 41.5

Wednesday 25 February 2026

Keystones #56 · Five questions · Open this day only

  1. 1. Number

    87 is rounded to the nearest integer. What is the error interval?

    Answer: 86.5 ≤ x < 87.5
  2. 2. Algebra

    Solve: 2x + 3y = 32 and 3x - y = 26

    Answer: x = 10, y = 4
  3. 3. Geometry

    Find the distance between (-6, -4) and (11, 12)

    Answer: 23.35
  4. 4. Ratio

    A car worth £5,520.00 depreciates by 16% each year for 3 years. What is it worth after 3 years?

    Answer: £3,271.73
  5. 5. Statistics

    A bag has 3 red out of 10 balls. If you pick 123 times (with replacement), how many times would you expect red?

    Answer: 36.9

Thursday 26 February 2026

Keystones #57 · Five questions · Open this day only

  1. 1. Number

    47 is rounded to the nearest integer. What is the error interval?

    Answer: 46.5 ≤ x < 47.5
  2. 2. Algebra

    Solve: 2x + 3y = 36 and 3x - y = 21

    Answer: x = 9, y = 6
  3. 3. Geometry

    Find the distance between (-3, 2) and (7, 12)

    Answer: 14.14
  4. 4. Ratio

    A car worth £11,371.00 depreciates by 16% each year for 3 years. What is it worth after 3 years?

    Answer: £6,739.64
  5. 5. Statistics

    A bag has 5 red out of 13 balls. If you pick 91 times (with replacement), how many times would you expect red?

    Answer: 35

Friday 27 February 2026

Keystones #58 · Five questions · Open this day only

  1. 1. Number

    70 is rounded to the nearest integer. What is the error interval?

    Answer: 69.5 ≤ x < 70.5
  2. 2. Algebra

    Solve: 2x + 3y = 29 and 3x - y = 27

    Answer: x = 10, y = 3
  3. 3. Geometry

    Find the distance between (2, -5) and (8, 6)

    Answer: 12.53
  4. 4. Ratio

    A car worth £18,948.00 depreciates by 22% each year for 5 years. What is it worth after 5 years?

    Answer: £5,470.62
  5. 5. Statistics

    A bag has 4 red out of 15 balls. If you pick 121 times (with replacement), how many times would you expect red?

    Answer: 32.3