I NEED HELP !! You are having a conversation with your friend. Which of the following statements is true regarding the sound wave that travels from your friend's mouth to your ear? SELECT AN ANSWER

A . Only sound, not energy, is transferred through the sound wave.

B. There is no medium for the sound wave to travel through.

C. The sound wave is traveling through air as the medium.

D. The air molecules travel from your friend's mouth to your ear.

c. i think im not entirely sure

12000j is work done

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.