Help lord mercy ‍♂️

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 expression is equivalent to the expression shown?

The sales totals at macy's food store have increased exponentially over the months. which of these best shows the sales in the first three months?