Anewly discovered solar system is found 300 billion kilometers from the sun. how many au does this represent? show your work.

1 AU means 1 astronomical unit or the aproximate distance from the earth to the sun

1AU=149597870.7 kiometers

1 billion=1,000,000,000

600 billion=600,000,000,000

x times 1AU=600,000,000,000

x times 149597870.7=600,000,000,000

solve for x

divide both sides by 149597870.7

x=4010.75

so aprox 4011 AU's

there's the proffessional site that will you.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.