Mary used addition of two rational numbers to solve a problem john used subtraction to solve the same problem. is it possiblr they both solved the problom correctly?

Ineed i do not understand i'm only 8

Which question is not a good survey question? a.don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d.are you happy with the availability of electronic products in your state?

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