(4/5 -7/5) + 1/5= Please hurry

What is the first step of an indirect proof of a number that is divisible by two

Explain how you do each step what term makes it inconsistent y=2x - 4 ?

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