Plsss help mee answer

Standard deviation of 19,29,21,22,23

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.

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c