Which represents a reduction?

Question

A
(x,y) —> (0.9x, 0.9y)
B
(x,y) —> (1.4x, 1.4y)
C
(x,y) —> (0.7x, 0.3y)
D
(x,y) —> (2.5x, 2.5y)
11
Which set of lengths are not the side
lengths of a right triangle?
A
28, 45, 53
B
13, 84, 85
C
36, 77, 85
D
16, 61, 65

not sure at all

Answer 1

(x,y) —> (0.9x, 0.9y)

sqrt(28^2+45^2)=53
sqrt(84^2+13^2)=85
sqrt(36^2+77^2)=85
sqrt(16^2+61^2)=63.5