What is 722,899 rounded to the nearest ten?

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

Two numbers have a sum of -19. one number is x. what expression represents the other number?