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21. If loga( 175 = 3, then a is equal to A. 5 B. V125 C D. 22. Solve for x: 273x-1 = 81*+8 A. X =7 B. X =2 C. _ 35 : 13 D. x = 29 23. Which of the following is equal to log2 (16mn)? A. 4 log2 m + log2 n B. 2 (log2 m + log2 n) C. 4 + log2 m + log2 n D. log2 16 - log2 m + log2 n 24. In logarithmic form, 27/3 = 3 is A. log27 3 = B. log3 27 = C. log1 3 = 27 D. 1083 = 27 25. The approximate value of x in the equation 2(3)*-1 = 7 is A. 2.09 B. 2.14 C. 2.22 D. 2.32 26. Loudness of sound in decibels is given by L = 10 log () where L is loudness of sound, I is the intensity of sound, I, is the minimum intensity audible to the ear. If the intensity of a certain sound is 500 times the minimum intensity, its loudness measured in decibels is A. 10 log 50 B. log 500 C. 37 D. 27 27. A town's population is increasing at a constant rate of 2.6% per year. This year on January 1, the population of the town was 16 000. The minimum number of complete years from January 1 that it will take for the town's population to exceed 20 000 is A. 8 B. 9 C. 10 D. 11