1. Express 0.091 in scientific notation. A. 9.1 × 10-2 B. 9.1 × 102 C. 9.1 × 101 D. 9.1 × 10-1 Hint 2. Simplify (18q3r)(2qr4). A. 36q4r5 B. 36qr C. 36q3r4 D. 36q3r5 Hint 3. Simplify (4r - s) - (r + 2s) + (3r - s). A. 3r - 2s B. 8r C. 6r - 4s D. 6r - 3s Hint 4. Factor 6x3y + 15x2y2 - 3x4y. A. 3x2y(2x+ 5y - x2) B. xy(6x2 + 15xy - 3x3) C. 3xy(2x2 + 5xy - x3) D. x2y(6x + 15y - 3x2) Hint 5. Simplify A. -13 B. ±13 C. 13 D. ±84.5 Hint 6. A. x2 B. |x5| C. |x| D. x Hint 7. Simplify A. B. 0 C. D. Hint 8. Simplify A. B. C. D. Hint 9. Solve A. 49 B. 7 C. 14 D. -49 Hint 10. Solve A. B. 5 C. D. Hint 11. Simplify A. 2i B. C. D. Hint 12. Simplify (8 - 9i) + (3 + 4i). A. 17 + 7i B. -i + 17 C. 11 - 5i D. 11 + 5i Hint 13. Determine whether the expression 5x3y3 – x2y2 is a polynomial. A. Cannot be determined from given information. B. No, because there are two variables. C. Yes. D. No, because there are two terms. Hint 14. Simplify A. B. C. D. Hint 15. Simplify A. B. C. D. y + 7 Hint 16. What is the GCF of A. 3n B. n C. p2 D. np Hint 17. Solve: A. B. C. D. Hint 18. Simplify A. B. C. D. Hint