6 Two cyclists, A and B, have displacements 0 km and 70 km, respectively. At t=0 they
begin to cycle towards each other with
velocities 15 km h and 20 km h-',
respectively. At the same time, a fly that was
sitting on A starts flying towards B with a
velocity of 30 km h-'. As soon as the fly
reaches B it immediately turns around and
flies towards A, and so on until A and B meet.
(a) What will the displacement of the two
cyclists and the fly be when all three
meet?
(b) What will be the distance travelled by the
fly?

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

28. evolution

29. environment, survive, offspring  

explanation:

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.