If a quadrilateral is a kite, then its diagonals are perpendicular. true false

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.

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

Prove that 16^4-2^13-4^5 is divisible by 11.