Which of the following best describes the gravitational binding of galaxies?

a. they are arranged from smallest to largest.

b. there is no certain arrangement.

c. they are found in clumps called clusters or superclusters.

d. they often violently collide because of their absence of gravity.

The answer is C.) Hope this helps!

c) They are found in clumps called clusters or superclusters

hope this helps!

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.