Which of the following statements regarding orbits is true? A. The central body is located at one focus of the ellipse describing the orbit.
B. In an orbit, the satellite and the central body are the two foci of the ellipse.
C. The Sun and a planet are the two foci of the orbit.
D. In an elliptical orbit, there is one focus and the satellite is located there.

A

Explanation:

this is Keplers second law, "all ellipses are elipticle with the center of gravitation at one". focii (a line in the middle of a ellips)

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.