Help please! Simplify 7/ √x

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?

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Atemperature of 1.64◦f corresponds to answer in units of ◦c.