Mr. Kim found batteries on sale for $6.89 per pack. He bought a dozen packages for the set of graphing calculators in his classroom. How much did he spend on the batteries?

7x+8y=-18, 4x-9y=-3 solve the system of equations

Cass decided to sell game programs for the hockey game. the printing cost was over 20 cents per program with a selling price of 50 cents each. cass sold all but 50 of the programs, and made a profit of $65. how many programs were printed? letting p represent the number of programs printed, set up an equation that describes this situation. then solve your equation for p.

Daniel bought a computer game for $25 and later sold it to thomas for a 40% profit. how much did daniel sell the computer game for?