Alguien podría ayudarme con la de abajo no le entiendo

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

Miss henderson wants to build a fence around a rectangular garden in her backyard in the scale drawing the perimeter of the garden is 14 in of the actual length of a b is 20 ft how many feet of fencing what you need

An engineer scale model shows a building that is 3 inches tall. if the scale is 1 inch = 600 feet, how tall is the actual building?