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5(-9w) put expression in distributive property

Student price tickets to a movie are $1 and non student tickets are $2 . 350 tickets are sold and the total amount made is $450. there were 250 student tickets sold . true or false .

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