Step by step solution

1024 -2 11. Evaluate log 3 243 a. 9 C. -10 16 b -5 d. 10 12. Solve for x. log, 81 x = 9 a. x = 18 C. x = 6561 b. x = 81 d. x = 36 Page 2 of 3 SECTION B: Application: ............... /8 points 13. The half-life of a radioactive substance is 97 years. If 10 mg are produced after a reaction, approximately how long will it take for only 1 mg to remain? a. 29 years c. 462 years b. 322 years d. 180 years 14. The hydronium ion concentration of a solution with a pl of 9.26 is approximately a. 5.50 x 10-10 mol/L C. 2.15 x 10 mol/L b. 0.966 mol/L d. 9.26 x 10- mol/L 15. The restriction on the variable in the expression log[ 2x2 - 5x - 3 ) - log( x2 - 7x + 12 ] is a. x24 C. 2 b. x>3 d. A and C 16. The ratio of intensities of two sounds is 4261. If the quieter sound has a decibel level of 104 dB, what is the decibel level of the other sound? a. 140.3 dB 67.7 dB