What tag is better? Relm or Sore

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.

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20