Ascientist needs 30% solution of acid. he has 4 liters of a 20% solution. how much pure acid does the scientist need to add to get the 30% solution? answer using a table and using one variable only.

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.