Solve on the interval [0,2pi) 4cscx+1=-3

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.

Find the domain of the following expression: 1/(√x)-2

Which fraction is equal to 1hole and 2/5? a.3/5 b.75 c.57 d.73