A chemist has 30% and 60% solutions of acid available. How many liters of each solution should be mixed to obtain 90 liters of 32% acid solution?

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.