Iam having trouble with this problem 2/12 +6/4 =?

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?

Can some one explain this i got sent this. is this a threat i’m scared

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is