Solve for the unknown side of each right triangle

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?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

Consider the image of klmn for the translation (x, y) → (x – 2, y – 1). what is the ordered pair of l′?