How are moving pulleys different from fixed position pulleys?
a: moving pulleys are easier to use than fixed-position pulleys.
b: moving pulleys have more force than fixed-position pulleys.
c: moving pulleys are attached to the object and are stationary. fixed-position pulleys are connected to a fixed point and move freely.
d: moving pulleys are attached to the object and move with the object. fixed-position pulleys are connected to a fixed point and do not move.

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.

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