Which of the following is precise given that the accepted value is 5.345 and the observed values are 3.253, 3.45, and 3.732?

3.253
3.457
3.732
all of the above
none of the above

[multiple choice] if given an accepted value of 5.95 m and three observed values of 5.73 m, 5.90 m, and 5.95 m, the observed value of 5.90 m

is accurate.
is precise.
has only two significant digits.
has at least one digit that is not significant.
has a percent error of −0.8%.
is equivalent to 5.90 109 nm.
has a derived si unit.

and explanation for these too.. and you! i'd really love to understand these.

the answer is a. at the equator

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.