How many sig figs does the number "7.500 x 10^8" have?

4 digits that are 7,5,0,0

Explanation:

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.

let that person have a turn to speak : )