Tell whether the two rates form a proportion. -0.4 kilometer for every 15 minutes
-0.6 kilometer for every 20 minutes

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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the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

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