Which algebraic representation of a transformation on a coordinate grid dose NOT preserve congruence?

Sienna planned a trapezoid-shaped garden, as shown in the drawing below. she decides to change the length of the top of the trapezoid-shaped garden from 32 ft to 24 ft. which expression finds the change in the scale factor?

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?