I need help asap i will give brainlist

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?

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

What could explain what happened when the time was equal to 120 minutes