7.82 x 10^4 m = 7.82 x 10^? km

Help me please

78.2 km

Explanation:

km is greater unit than meter and 1 km has 1000m so divide 78200 by 1000 we get 78.2 km so answer would be 7.82 x 10^1

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.