Ignore the writing in black by the way ‍♀️

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Acertain drug is made from only two ingredients: compound a and compound b. there are 3 millimeters of compound a used for every 4 millimeters of compound b. if a chemist wants to make 693 milliliters of the drug, how many milliliters of compound a are needed?

What does the pair of equations y = 1, z = 8 represent? in other words, describe the set of points (x, y, z) such that y = 1 and z = 8?