Find the scale of each map corresponds to an actual distance of 4 km

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.

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Calculate the annual effective interest rate of a 12 % nominal annual interest rate compound monthly