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

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.