Question 1167127
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The five sets together exactly cover the whole number line without overlap, so they form a partition of the real numbers.<br>
A5: -infinity to -10, not including -10
A3: -10 to -1, including both endpoints
A1: -1 to 1, including neither endpoint
A2: 1 to 10, including 1 but not 10
A4: 10 to infinity, including 10<br>