Ahuman hair is approximately 57 um in di-
ameter.
express this diameter in meters.
answer in units of m.

The diameter of 57 um is equal to 5.7*10^-5 in meter.

Explanation: 1 micrometer is equal to 1*10^-6 meters.

We use this conversion to get the answer, we that 57 and we multiply it by 1*10^-6

magnified images possible images can be real = projected onto a screen

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.