Common Core: A-REI.3
Problem 6 of 18a1-006
Which interval contains exactly the values of that make true?
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Solution walkthrough2:22
- This says is more than and at most : it sits between them. Do the same to all three parts.
- Subtract from all three parts: , so .
- Divide all three parts by . It is positive, so the signs stay the same: .
- Open circle at (left out), filled dot at (kept), shade between. As an interval: .
- With "or", a number needs only one part true. or gives two rays.
- Traps: swaps the brackets, and change only the middle.