Which of the following best describes the difference between two different units of distance in space?
1.An AU is useful for measuring objects fewer than 300 light-years
from Earth; a parsec is useful for measuring objects more than 300
light-years from Earth.
2.An AU is calculated by dividing kilometers by 150 million; a light-year
is calculated by determining how long it takes and object to travel
150 million AUs.
An AU is useful for measuring distances within the solar system; a
light-year is useful for measuring distances beyond the solar system.
An AU equals the distance between Earth and the Sun; a parsec
equals the angle between an object's apparent positions when viewed
from two different locations.

An AU equals the distance between Earth and the Sun; a parsec

equals the angle between an object's apparent positions when viewed

from two different locations.

Explanation:

Light year is the distance light travels in one Earth year.  1 light year is equal to .

An astronomical unit  (AU) is the average distance between the earth and the sun.  An AU is approximately 150 million km.

A parsec is the distance at which one astronomical unit subtends an angle of one second of arc.  1 parsec is equal to 20600 AU.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min

the journeys of marquette, joliet and la salle a) new france expand.

all three of these explorers explored the midwest and the area around the great lakes, which they subsequently claimed for france.

this was a big portion of territory and expanded new france which before then only consisted of quebec province in northeastern canada