(6^4)(6^−2) = please help will get brainliest!

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.