Can you answer my questions please in my profile because tomorrow is the deadline​

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 the size of the matrix resulting from

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle