What is the answer for 23/4 + -23/4 - -15/4 + 9/4

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.

Use circumcenter theorem to solve for the given values

Which polygon is she in the process of constructing ?