Please look at photo. Help please. Algebra 1 problem.

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?

Which of the following expressions is equal to 2x^2+8

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?