What percent of 21 is 11.8? Round the answer to the nearest
hundredth of a percent if necessary.

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 sin 7x/4 ? i need on this urgent trig

Identify the graph of y = ln x + 1.