Find the measure of unknown angles. the shape is triangle. the top is 72° and there is and x and a y on the bottom of the other angles. There is a exterior angle outside the triangle. please help me

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?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)