12n+2=-46 to find the match and complete the sentence

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?

For what value of x does 4x = (1/8) x + 5?

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left