What are solution of this questions?

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

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i

What is the y-intercept of the line with the equation 3x + 4y = 12?