Chandra has 2 liters of a 14% solution of sodium hydroxide in a container. what is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 7 liters of a 34% solution?

Itook a better photo of the question so y’all can see it i hope it’s a fine photo

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Need on this geometry question. explain how you did it.