4. A substance is cut into several piece and compared to the density of the original sample. The density of each piece will be:-
areater
bl the same​

The density pf each piece will be the same, since density is defined as a mass per unit volume, so even when you cut an object it will not change

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.