Pls help? I need to know the answer asap

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?

Can someone tell me if this is perpendicular? !

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?