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AP Precalculus

AP Precalc Unit 2A (2.1–2.6): Exam Mock MCQ

Shared by ashtont · Nov 2, 2026 · 0 plays

20-question mock of the Unit 2A AP Readiness test (2.1–2.6): sequences, exponential functions, equivalent forms, modeling, residuals. Part A no calculator, Part B calculator. Every question has a stimulus and explanations for each choice.

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20 questions across 2 sections. After every answer you’ll see why each choice is right or wrong, not just the one you picked.

Round length
Sections (none selected means all)

Sample questions

Open a question to see the answer choices and the correct answer.

Which of the following statements about g is true?
  1. A. g is always decreasing, and the graph of g is always concave up. ✓
  2. B. g is always increasing, and the graph of g is always concave down.
  3. C. g is always decreasing, and the graph of g is always concave down.
  4. D. g is always increasing, and the graph of g is always concave up.

Correct answer: A. A = 3 > 0 and 0 < b = 0.4 < 1, so g decays. Every exponential abˣ with a > 0 is concave up, whether it grows or decays.

Which of the following models the population as a function of t, in years, for 0 ≤ t ≤ 10?
  1. A. 18,400(0.035)ᵗ
  2. B. 18,400 − 0.035t
  3. C. 18,400(0.965)ᵗ ✓
  4. D. 18,400(1.035)ᵗ

Correct answer: C. Losing 3.5% leaves 100% − 3.5% = 96.5% each year, so the growth factor is 0.965.

What is the y-coordinate of the point on the graph where x = 0?
  1. A. 81 ✓
  2. B. 24
  3. C. 56
  4. D. 54

Correct answer: A. From x = 2 to x = 4 the output is multiplied by 16/36 = 4/9, so b² = 4/9 and b = 2/3. Going back two units divides by 4/9: 36 ÷ (4/9) = 81.

Which of the following is NOT an equivalent form for h(x)?
  1. A. 32(4)^(x/2)
  2. B. 8(2)^(x + 3) ✓
  3. C. 4(2)^(x + 3)
  4. D. 32(2)ˣ

Correct answer: B. This is the one that is NOT equivalent. 8 = 2³, so 8(2)^(x+3) = 2^(x+6), which is one unit off.

Which of the following statements about K is true?
  1. A. K models the height of the water as a function of time. ✓
  2. B. K models the height of the water as a function of the amount of water.
  3. C. K models time as a function of the height of the water.
  4. D. K models the amount of water as a function of the height.

Correct answer: A. Time goes into W and comes out as gallons; gallons go into H and come out as inches. Input of K: minutes. Output: inches.