Which of these is correct
(84)5 (73)9 = 84 + 573 + 9 = 89712
or
(84)5 (73)9 = 84•573•9 = 82072

Find cot x if sin x cot x csc x = √2

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?