Factorise 3+81x³y³ step by step explanation

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.

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.