MHF4U Write True or False [6 - K/U] 1. If y - 3*, then x - log;). 2. You can write log 254 as 4log25_ 3. The yintercept for all exponential functions is 1. 4. The yintercept of the exponential function y=6' is 1. 5. Logarithmic functions are defined only for positive values of the base that are not equal to 1. log 4 You can write log, 21 6. as log 21 .17. A jackhammer has a decibel level of 107 dB, while city traffic has a decibel level of 69 dB. How many times as intense as the sound of the city traffic is the sound of a jackhammer? a. 1.43 c. 6309.57 b. 2.33 d. 627 281.18 18. While standing inside his house with the front door open, a man measured the sound level of a police siren blaring down the street to be 95 dB. With the front door closed, the sound level is 80 dB. How many times as intense as the sound of the siren with the door closed is the same sound with the door open? a. 1.50 c. 1.04 b. 57.66 d. 31.6219. The pH of a solution with a hydronium ion concentration of 7.54 0 104 mol/L is a. 9.21 c. 3.12 b. 7.54 d. 6.41 20. The hydronium ion concentration of a solution with a ph of 9.26 is approximately a. 926 x 10- mol/L C. 5.50 x 10-" mol/L b. 0.966 mol/L d. 2.15 x 10- mol/L 21. What is the magnitude of an earthquake 1410 times as intense as a standard earthquake? a. 2.96 c. 3.15 b. 2.61 d. 3.74