△abc∼△def , △abc has a height of 20 inches, and △def has a height of 24 inches. what is the ratio of the area of △abc to the area of △def ? enter your answer, in simplest form, in the boxes. :

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor