What number multiplies itself to 121

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

This is about circle theorems. someone asap : (

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.