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Is a currency whose value is tied to another currency, meaning that the exchange is fixed

Evaluate the expression. (9 + 5)(3 + 2)0

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.