LESSON 2.1 Practice B For use with the lesson "Use Properties of Exponents" Evaluate the expression. Tell which properties of exponents you used. 1. 25 . 23 2. (-7)2(-7) 3. 4-6.4-1 4. (5-2)2 5. 6. 8-4 82 7. 8. -3 Write the answer in scientific notation. 9. (6.1 X 105)(2.2 X 106) 10. (2.6 X 10 7)(1.3 X 102) 11. (3.4 X 10-1)(3.1 X 10-2) 12. (5.8 X 10-7)(8.1 X 1012) 13. (4.5 X 104)2 14. (3.7 X 10-5)2 15. (7.2 X 10-3)3 16. 9.9 X 109 17. 8.4 X 10-6 1.5 X 108 2.4 X 109 L'Z NOSS37 Simplify the expression. Tell which properties of exponents you used. 18. 19. 20. (3253)6 21. (40% 2)-5 22. (142 2) (y -32-5) 23. (2min-")(8man -2) 24. (7c d2)-2 25. (584h - 3) - 3 26. xy-8 x 5 y - 6 16gor-6 27. 28. 12a-369 40- 3 , - 7 21a26-5 29. 8e-4f-2 18ef- Write an expression for the surface area or volume in terms of x. 30. S = 4Trz 31. V = -Trzh 32. V=>TP3 *2x2 33, Birds Some scientists estimate that there are about 8600 species of birds in the world. The mean number of birds per species is approximately 12,000,000. About how many birds are there in the world? Write your answer in scientific notation. 34. Biology A red blood cell has a diameter of approximately 0.00075 centimeter. If one of the arteries in your body has a diameter of 0.0456 centimeter, how many red blood cells could fit across the artery? Write your answer in scientific notation. Algebra 2