These sounds will use air to reach the ears of the riders. The air particles will have compressions which travel in the same direction as the energy of the wave. This means sound waves are an example of a/an... Select all that apply (two answers).

A
electromagnetic wave.

B
longitudinal wave.

C
mechanical wave.

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.

c. magnitude and direction