Which property is shown in the matrix addition below? inverse property identity property commutative property associative property

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.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.