Can someone help please . my brain cells left me.

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 is (28 + 7 + 6 + 3) x 1/2 show your work

What is the reflection image of (5,-3) across the line y = -x?