Please answer this correctly

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?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

What are the values of each variable in the diagram below?