What is 438,902 rounded to the nearest ten thousand

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25