What multiplication equation is represented below

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet

Could somebody me with this radical simplification?

Do,h = (7, 9) (14, 18) the scale factor is