Math 11 LE1 Reviewer - Mathematics 11 LE 1 Reviewer I True or False Write TRUE if the statement is III Factor completely always true Otherwise write

# Math 11 LE1 Reviewer - Mathematics 11 LE 1 Reviewer I True...

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Mathematics 11 LE 1 Reviewer I. True or False. Write TRUE if the statement is always true. Otherwise, write FALSE. 1. For any set A and B , if B A , then A C B C . 2. N is closed under subtraction. 3. For any real number a , a 0 = 1. 4. The set {- 1 , 0 , 1 } is closed under multiplica- tion. 5. For any sets A and B , n ( A B ) = n ( A )+ n ( B ). 6. Q 0 has a multiplicative identity element. 7. If a, b, c R and ac < bc , then a < b . 8. π ( Q C - R ). 9. 3 [( -∞ , 2) (4 , 7)] (0 , 6]. 10. x 2 y + 2 y - x - 1 is a degree 3 polynomial. 11. | π - 4 | = π - 4. 12. If | x | > 0, then x is positive. II. Do as indicated. 1. WriteA, BandCin roster form. 2. Write the following sets in roster form: (c)ABC(d) (AB)-C(e) (B-A)×C(f)P(AC)3. Find the quotient and remainder using long di-vision: III. Factor completely . 1. 16 x 4 - 1 2. x 4 - 7 x 2 y 2 + 9 y