HELP PEASE ASAP 20 POINTS

What is 3x19x28/39x90x2/0

Alocal concert promoter purchases 2 3/4 pages of ads. when one of the concerts is cancelled, the promoter cancels 1 5/8 pages of ads. how much advertising space is the concert promoter actually using?

How does a low unemployment rate affect a nation's economy? a. the nation has a higher number of productive resources. b. the nation can spend more money on for unemployed people. c. the nation can save money by paying lower salaries to a large workforce. reset

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