What’s the equation to convert 100 inches per minute to feet per hour

What number produces an irrational number when multiplied by -1.25

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.

In the diagram of circle o, what is the measure of zabc?