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Step-by-step explanation: this is the easiest way to explain it-

20= 100%

10=50%

5=25%

10 is 50

9 is 45

8 is 40

7 is 35

6 is 30

5 is 25

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,