What kind of transformer decreases the voltage of an alternating current

That device would be called a "step-down" transformer.  If you completely took it apart and unwound all the wire in it, you'd find that it has more turns of wire in the primary (higher voltage) side, and fewer turns in the secondary (lower voltage) side.

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.

true is the correct answer

hope i