During a game, Dennis lost 50 points in the first round and then lost 75 more points in the second round. Write an addition expression for the change in Dennis's score after two rounds, and then find the change.
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Bill makes leather shoes. he charges $45 for a pair of women's shoes and $50 for a pair of men's shoes. he sells x pairs of women's shoes and y pairs of men's shoes each week and earns a total income of $2,500. this situation can be represented by the equation . if bill has no female customers during a particular week, he needs to sell pairs of men's shoes to earn his weekly income of $2,500.