III. Solve the following with the correct number of significant
figures.

a. 8.5 x 10^5 + 7.3 x 10^6
b. 391 - 2.4 x 10^3
c. (2.30 x 10^4) (6.35 x 10^8)
d. 9.5 x 10^9 / 5.9 x 10^4

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

the answer is b. dilution

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.