Mariko has 30 nickels and dimes. she has 12 more nickels than dimes. how many dimes does mariko have?

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

Each cookie sells for $0.50 sam spent $90 on baking supplies and each cookie cost $0.25 to make how many cookies does sam need to sell before making a profit formula: sales> cost