Can someone help me with this?

C would make the most sense.

Explanation:

ok so basically the reason why i chose C is because i've always been told that whatever i type, send, or receive on my phone is stored into the phone's memory and can be brought back up with keystrokes. so yeah, i'd go with C but it's DEFINATELY not A or D.

need to see circuit to get time constant

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.