Which pair of ratios does not form a proportion?

D

Step-by-step explanation:

D. 12/15 = 4/5, 30/50 = 3/5. The ratios must be equal to form a true proportion.

expression #3 is not equivalent. the others are.

given that triangle abc is transformed two times to get triangle

a"b"c"

first abc is transformed in to a'b'c' as follows:

the coordinates of a are (1,-1) and transformed into a'(-1,1)

similarly b (4,-2) became b'(-4,2) and

c(7,-2) became c'(-7,2)

i.e. (x,y) becomes (-x,-y)

this is nothing but reflection about a point here origin.

thus first transformation is reflection on the origin.

next is exactly shifting 3 units down

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