Which one is an exponential function

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?

Will give brainliest immeadeately true or false: the origin woud be included in the solution set for the inequality: y< 2x-5

What’s the range cuz i can’t find it?