Answer:
In mathematics, the empty set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero.
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Step-by-step explanation:
Answer: 56
Step-by-step explanation:
Answer:
ABC
Step-by-step explanation:
Answer: Option C
, 
Step-by-step explanation:
If the lines m and n are parallel then the large triangle and the small triangle are similar triangles, because they have equal angles.
By definition for similar triangles it is satisfied that if they have sides of length a, b, c and a', b', c' then:

In this case

So:

Now solve the equation for the variable y



We know that
and 
Then


Finally the answer is:
, 