Of the 7.0 billion people who lived in the world, about 1.3 billion live in china. find at least 3 more real world numbers that are expressed as decimal millions or billions. Tell what each number describes.

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Simplify this expression. 8x 16(x + y)

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?