24. [1.11/3.33 Points] DETAILS PREVIOUS ANSWERS SPRECALC7 4.7.007. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER If the pH of a wine is too high, say, 4.0 or above, the wine becomes unstable and has a flat taste. (a) A certain California red wine has a pH of 3.1, and a certain Italian white wine has a pH of 2.8. Find the corresponding hydrogen ion concentrations of the two wines. (Enter your answers to five decimal places.) California red 7.9432 X M Italian white M17. [0/3.33 Points] DETAILS PREVIOUS ANSWERS SPRECALC7 4.6.028.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A graphing calculator is recommended. This exercise uses Newton's Law of Cooling. A kettle full of water is brought to a boil in a room with temperature 20C. After 15 minutes the temperature of the water has decreased from 100 to 750C. Find the temperature after another 9 min. (Round your answer to one decimal place.) 63.5 X .C19. [-/3.33 Points] DETAILS SPRECALC7 4.6.025.MI. MY NOTES ASK YOUR TEA : . . . . . . . . . . . . . . . . . . . . . . . . . > > > > > > >.".""."""" This exercise uses Newton's Law of Cooling. A hot bowl of soup is served at a dinner party. It starts to cool according to Newton's Law of Cooling so that its temperature at time t is given by T(t) = 53 + 131e-0.05t where t is measured in minutes and T is measured in OF. (a) What is the initial temperature of the soup? OF (b) What is the temperature after 10 min? (Round your answer to one decimal place.) OF (c) After how long will the temperature be 100F? (Round your answer to the nearest whole number.) min Need Help? Read It Watch It Master It Submit Answer(a) Find the exact solution of the exponential equation in terms of logarithms. X = 1.25 log 3 X (b) Use a calculator to find an approximation to the solution rounded to six decimal places. X = 0.5964015 X Need Help? Read It Submit Answer Type here to search O Eli12. [-/3.33 Points] DETAILS SPRECALC7 4.6.006. MY NOTES ASK YOUR TEACI . . .. This exercise uses the population growth model. The population of a certain species of fish has a relative growth rate of 1.3% per year. It is estimated that the population in 2010 was 12 million. (a) Find an exponential model n(t) = noert for the population (in millions) t years after 2010. n(t) = (b) Estimate the fish population in the year 2015. (Round your answer to three decimal places.) million fish (c) After how many years will the fish population reach 14 million? (Round your answer to one decimal place.)our last submission is used for your score. 27. [0/3.33 Points] DETAILS PREVIOUS ANSWERS SPRECALC7 4.7.015.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The intensity of the sound of traffic at a busy intersection was measured at 9.0 x 10 9 W/me. Find the decibel level. (Round your answer to the nearest whole number.) 65 x dB Need Help? Read It Watch It Master It Submit Answer14. [-/3.33 Points] DETAILS SPRECALC7 4.6.017. MY NOTES ASK YOUR TE This exercise uses the radioactive decay model. The half-life of radium-226 is 1600 years. Suppose we have a 28-mg sample. (a) Find a function m(t) = mo275/h that models the mass remaining after t years. m(t) (b) Find a function m(t) = moet that models the mass remaining after t years. (Round your / value to six decimal places.) m(t) = (c) How much of the sample will remain after 2500 years? (Round your answer to one decimal place. ) mg (d) After how many years will only 17 mg of the sample remain? (Round your answer to one decimal place. ) yr18. [-/3.33 Points] DETAILS SPRECALC7 4.6.027.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANO This exercise uses Newton's Law of Cooling. A roasted turkey is taken from an oven when its temperature has reached 185F and is placed on a table in a room where the temperature is 730F. (a) If the temperature of the turkey is 1450F after half an hour, what is its temperature after 45 min? (Round your answer to the nearest whole number.) OF (b) After how many hours will the turkey cool to 100F? (Round your answer to one decimal place.) hr Need Help? Read It Watch It Master It Submit AnswerYour last submission is used for your score. 30. [1.72/3.43 Points] DETAILS PREVIOUS ANSWERS SPRECALC7 4.7.002.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANC An unknown substance has the hydrogen ion concentration of [H ] = 3.6 x 1079 M. Find the pH. (Round your answer to one decimal place.) 7.613. [1.67/3.33 Points] DETAILS PREVIOUS ANSWERS SPRECALC7 4.6.011. MY NOTES ASK YOUR TEACHER PR This exercise uses the population growth model. The graph shows the deer population in a Pennsylvania county between 2010 and 2014. Assume that the population grows exponentially. n(t) (4, 31,000) 30,000 Deer 20,000 population 10,000 0 2 3 Years since 2010 (a) What was the deer population in 2010? 20,000 V deer (b) Find a function that models the deer population t years after 2010. (Enter your answer in the form noe. Round your r value to four decimal places.) n (t ) = 0.1096 X c) What is the projected deer population in 2020? (Round your answer to the nearest thousand. ) deer loudy