Evaluate the expression when x=-6 and y=3.
y - 2x

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?

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?