What is the value of (-7 + 31) – (2 - 6/)?

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

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.