Yall i need help whats a unit rate i forgot oof

Solve |2x - 5| = 4 if anyone could , that would be great

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?

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