1. {2}
2. {1}
3. {−230−−√5, 230−−√5}
4. 6 cm by 9 cm
5. {−9,−4}
6. $8200
7. 1 in.
8. {−4,−52}
9. 19, (x+13)2
10. {56−37−−√6, 56+37−−√6}
11. 9 in.
12. {−6−3–√,−6+3–√}
13. {−5, 0, 5}
14. {4}
15. {−12,−6}
16. [90, ∞)
17. (−12, 72)
18. (−∞,−2)∪(5, ∞)
19. (−∞, 2]
20. [25, 2]
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