Find ST with coordinates S (-5, 7) and T (3, -4)

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?

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)