New York Stock Exchange Vault is fifteen and twenty-four hundredths meters below sea level

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

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

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?