Let \( I_{0} \) be the intensity of sound at the threshold of human hearing. The decibel level of a sound with intensity I is given by \( \mathrm{dB}=10 \log _{10}\left(\frac{1}{I_{0}}\right) \). If the intensity of a sound increases by a factor of 50 , how is the decibel level affected? Round your answer to the nearest tenth.

2. Para alimentar a mi mascota compré una bolsa de 30 kgrs de alimento, al día siguiente gasté \( 2 / 5 \) de ella y tres días después gasté \( 1 / 3 \) de lo que me quedaba. ¿cuántos kilogramos me quedaron? ¿qué fracción del total me quedó?

12) An average 12 -ounce can of beer contains about 15 grams of alcohol. Consider a person with approximately 6 liters ( 6000 milliliters) of blood, who quickly drinks two cans of beer. If all the alcohol were immediately absorbed into the bloodstream, what blood alcohol content would we find?

If a worker accidentally drops a bolt from the top of a 2304 foot tall tower, the height of the bolt after \( t \) seconds is given by the expression \( 2304-16 \mathrm{t}^{2} \). a. Find the height of the bolt after 2 seconds. b. Find the height of the bolt after 5 seconds. c. To the nearest whole second, estimate when the bolt hits the ground. d. Factor \( 2304-16 t^{2} \).

Determine the inverse function of \( f(x)=5^{x-4} \).

a) \( \frac{2}{3}+\frac{4}{5}= \)