One more than the difference between a number and nine is three

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

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.

Solve the equation x/4 - 5= -8 -27 -12 -7 12