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Pearson MyLab Answers & Practice Questions

Take a free practice quiz or point your phone at any Pearson MyLab question for an instant, explained answer — Math, Economics, and Science homework, without the guesswork.

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Three steps, a few seconds each.

01

Snap a photo

Point your phone at the question — on a screen, a printout, anywhere.

02

Get the answer

Cambo reads the question and answers it in a few seconds.

03

See the explanation

Read the reasoning behind the answer so it actually sticks.

Built for exactly this kind of question.

MyLab platforms like MyMathLab and MyEconLab often generate a different set of numbers for every student on the same problem template, so a shared answer key is useless and the actual arithmetic or setup matters more than memorizing a result. Cambo reads the exact numbers in front of you and walks through the specific calculation, so it works no matter which randomized version you got.

Test yourself with real practice questions.

Solve for x: 3x + 7 = 22

  1. Ax = 3
  2. Bx = 5
  3. Cx = 7
  4. Dx = 15
Tap the card to reveal the answer
Answer
Bx = 5
x = 5 — subtract 7 from both sides to get 3x = 15, then divide both sides by 3.

A firm operates in a perfectly competitive market. In the short run, it should continue producing (rather than shut down) as long as:

  1. ATotal revenue exceeds total cost
  2. BPrice exceeds average variable cost
  3. CPrice exceeds average fixed cost
  4. DMarginal cost is falling
Tap the card to reveal the answer
Answer
BPrice exceeds average variable cost
Price exceeds average variable cost — in the short run a firm should keep producing as long as it covers its variable costs, even if it isn't covering total (fixed + variable) costs.

Which organelle is primarily responsible for producing ATP through cellular respiration?

  1. ARibosome
  2. BGolgi apparatus
  3. CMitochondrion
  4. DLysosome
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Answer
CMitochondrion
The mitochondrion — often called the powerhouse of the cell, it converts nutrients into ATP through cellular respiration.

Balance the following chemical equation: __ H2 + __ O2 → __ H2O

  1. A1 H2 + 1 O2 → 1 H2O
  2. B2 H2 + 1 O2 → 2 H2O
  3. C2 H2 + 2 O2 → 1 H2O
  4. D1 H2 + 2 O2 → 2 H2O
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Answer
B2 H2 + 1 O2 → 2 H2O
2 H2 + 1 O2 → 2 H2O — this balances 4 hydrogen atoms and 2 oxygen atoms on each side of the equation.

Find the derivative of f(x) = 4x^3 - 2x + 5.

  1. Af'(x) = 12x^2 - 2
  2. Bf'(x) = 4x^2 - 2
  3. Cf'(x) = 12x^2 + 5
  4. Df'(x) = 12x^3 - 2x
Tap the card to reveal the answer
Answer
Af'(x) = 12x^2 - 2
f'(x) = 12x^2 - 2 — apply the power rule to each term: the derivative of 4x^3 is 12x^2, the derivative of -2x is -2, and the derivative of a constant (5) is 0.

If the price of a good rises and total revenue falls as a result, demand for that good is:

  1. APerfectly inelastic
  2. BInelastic
  3. CElastic
  4. DUnit elastic
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Answer
CElastic
Elastic — when a price increase causes total revenue to decrease, the percentage drop in quantity demanded outweighs the percentage increase in price, which is the definition of elastic demand.
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Questions, answered.

What is Pearson MyLab?

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MyLab is Pearson's family of online homework and assessment platforms — including MyMathLab, MyEconLab, and the Mastering Biology/Chemistry line — used alongside Pearson textbooks for auto-graded homework, quizzes, and practice problems.

What subjects is MyLab most commonly used for?

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Most often Math, Economics, Biology, and Chemistry, though the umbrella covers other Pearson course lines as well.

Why do my MyLab numbers look different from my classmate's?

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Many MyLab problems are algorithmically randomized — each student gets the same problem structure but different numeric values, so the setup and method matter more than any specific memorized answer.

Does Cambo work on numeric-entry questions, not just multiple choice?

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Yes — point your phone at the exact problem and numbers on your screen, and Cambo walks through the calculation and explains the method, whether the answer format is multiple choice or a typed numeric entry.

Is Cambo affiliated with Pearson?

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No. Cambo is an independent study tool and isn't produced, endorsed, or affiliated with Pearson.

What's the difference between MyMathLab, MyEconLab, and Mastering Biology/Chemistry?

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They're all part of the same MyLab platform family built on shared Pearson infrastructure, just branded and stocked with content for different subjects — the underlying homework/quiz mechanics work the same way across them.

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