Brainiest :) do these following ratios perform a proportion explain how u know 4 : 14 and 12 : 40

9 : 3 and 45 : 15

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

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?

Run a linear regression to determine an equation (y=mx+b y=mx+b)