Which fraction is equivalent to negative 7 over 8?

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

How do you find principle and simple interest