Help me plz Ik the quality isn’t the best

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

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?

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000