Match each set builder expression with the correct interval by selecting a letter from each drop down selector.

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  1. (a,b)\displaystyle {\left({a},{b}\right)}
  2. [a,b]\displaystyle {\left[{a},{b}\right]}
  3. (a,+)\displaystyle {\left({a},+\infty\right)}
  4. (,b)\displaystyle {\left(-\infty,{b}\right)}
  5. (,b]\displaystyle {\left(-\infty,{b}\right]}
  6. (,+)\displaystyle {\left(-\infty,+\infty\right)}
  7. (a,b]\displaystyle {\left({a},{b}\right]}
  8. [a,b)\displaystyle {\left[{a},{b}\right)}
  9. [a,+)\displaystyle {\left[{a},+\infty\right)}