(6^-2·6^5)^-3 can't figure out the answer

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

How many and of which kind of roots does the equation f(x)=x3−x2−x+1

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?