In Exercises 21–42, evaluate each expression without using a calculator. 21. log, 16 23. log, 64 22. log, 49 24. log; 27 26. log, 25. log, 27. log: 29. log,V7 31. log, 33. logsa8 35. logs 5 37. log, 1 39. logs 5 41. 8log, 19 28. log, 30. log, V6 32. log3 v3 34. logsi 9 36. logi1 11 38. log, 1 40. log, 46 42. 7log, 23

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