Solve for x: 3x − 7 = 20
Answer in (no unit).
Show the answer
9 (no unit)
Add 7 to both sides: 3x = 27. Divide both sides by 3: x = 9. Check: 3 × 9 − 7 = 20.
Reference: Solving a two-step linear equation by inverse operations
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NCCER Core curriculum practice test
180 free practice questions for this exam, each with the reason for the answer and where to look it up.
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Trade math and blueprint reading: practice test
10 questions, graded as you go, with the reason for every answer. No sign-up.
Practice tests that prepare you for this exam
About the exam
| Exam | NCCER Core curriculum |
|---|---|
| Who runs it | NCCER |
| Where | United States |
Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.
Sample questions
How many board feet are in one piece of 2 × 10 lumber that is 16 ft long? Use nominal sizes and round to one decimal place.
Answer in board feet.
Show the answer
26.7 board feet
Board feet = thickness (in) × width (in) × length (ft) ÷ 12 = 2 × 10 × 16 ÷ 12 = 320 ÷ 12 = 26.67, about 26.7 board feet.
Reference: Board feet = T (in) × W (in) × L (ft) ÷ 12
Which type of drawing shows the inside construction of a wall or building as if it had been sliced through and the cut face exposed?
- Section view
- Elevation view
- Schedule sheet
- Site plan view
Show the answer
A. Section view
A section is drawn as though a cut were made through the object so the hidden construction, such as studs, insulation and footings, can be seen. An elevation shows only the outside surface.
Reference: Construction drawings: section views
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