How would I formulate this polynomial 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?

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct