20 POINTS I need your help

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?

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

Which expression is equivalent to -5(3x - 6/7)