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By which rule are these triangles congruent?

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?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.