Which transformation preserves the property of a shape of a figure

Dilations. A dilation is a transformation which preserves the shape and orientation of the figure, but changes its size. The scale factor of a dilation is the factor by which each linear measure of the figure (for example, a side length) is multiplied.

(12+x)/(15+x) = 85%(12+x)/(15+x) = 17/20240+20x=255+17xx = 5hence she needs to make 5 consecutive free throws