PLEASE HURRY Which statement describes gravity? There is no defined unit of measurement for gravity Gravity is the force that pulls objects toward Earth's center, Objects that have a small mass will have no gravitational pull. Gravitational pull between two objects decreases as the mass of one increases

The second statement is correct : Gravity is a force that pulls objects towards Earth's centre.

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.