How do you round to the nearest square mile

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.

What is the least common multiple of 8, 12, 7

What is the slope of the line that passes through ( 1,4) and (1,-3)