Charmaine purchased a prepaid phone card for $25. Long distance calls cost 9 cents a minute using this card. Charmaine used her card only once to make a long distance call. If the remaining credit on her card is $21.31 , how many minutes did her call last?

Ben wants to play a carnival game that costs $2. in his pocket he has 5 red tickets worth 35 cents each, and 15 blue tickets worth 10 cents each. which of the following systems of inequalities correctly represents the constraints on the variables in this problem? let represent the red tickets and b represent the blue tickets.

Solve 2x+y=3 x+y=5 in substitution method

The ksp expression for the system pbcl2(s) pb+2(aq) + 2 cl-(aq) is: [pbc12][pb+2][2cl-] [pb+2][cl-]2 [pb+2][2cl-]2 [pbcl2][pb+2][cl-]2 [pb+2][2cl-]2[pbcl2]