Can anyone help me with this math problem

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.

9/10 divide by -3/15 as a mixed number

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?