Write an expression to represent: the sum of nine and the product of two and a number x

It costs 4.25 for 1 pound of roast beef. how much will it cost to purchase 2.5 pounds of roast beef? round to nearest cent

Lucy spent $165 in december using a new credit card. in january, she began paying between $15 and $25 each month towards her account balance.

Ashley spent half of her lunch money on a turkey sandwich. then she spent two-thirds of the money she had left on a bottle of juice and the rest of the money on a cookie. if the cookie cost $.75, how much lunch money did ashley have to start with?