499. 24r³s 67²87 500. (¹²) ² 501. (8xy³) (-6x¹y6) 502. 4u (u²-9u + 1) 503. (m + 3) (7m - 2) 504. (n-8) (n²-4n+11) 505. (4x - 3)² 506. (5x+2y) (5x – 2y) 507. (15ry³-35x²y) ÷ 5xy 508. (32³-10x² + 7x+10) ÷ (3x + 2) 509. Use the Factor Theorem to determine if x + 3 a factor of z3 +82 +21x + 18. 510. Convert 112,000 to scientific notation. Convert 5.25 x 10-4 to decimal form. In the following exercises, simplify and write your answer in exponential notation. 511. (2.4 x 108) (2 × 10-5)

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