7.1 Review Worksheet (continued)
Simplify, if possible. 39. log 2 16 3
1 3
40. log(100) 0.1
41.
log 125 5
43. 3 log 4.52 3
44. log
42. log 3 3
7 + x
9 6561
Evaluate. 45.
46. log 25 125
47. log 4 9
log 16 1 2
48. After some complaints, it was found that the music from an outdoor concert was 5 decibels louder than the city’s allowable level of 100 decibels. The loudness L of sound in decibels is given by = L I where I is the intensity of sound and I 0 is the intensity of the softest audible sound. How many times more intense is the concert sound than the allowable level? I 10 log . 0
121
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