HELP ASAP PLS bottom u have to pick less or more

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 describes horizontal cross section of the right rectangle 6m 8m 5m

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?