Write an algebraic expression that models the situation.
jenny had $161, but she is spending $13 per week.
the algebraic expression that models the situation is |

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Aweekly newspaper charges $72 for each inch in length and one column width. what is the cost of an ad that runs 2 column inches long and 2 columns wide? its not 288