Idon't understand this question! hello

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 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

Which expression is equivalent to 3^3 + 2^2?