Plz, help. Find the angle ABC

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?

How much orange juice do you need to make 2 servings of lemony orange slush?

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?