Help would be so appreciated thanks

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?

What does the relationship between the mean and median reveal about the shape of the data

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"