I believe the answer is A. 20, 30, 40 is NOT a pythagorean triple.
Answer:

Step-by-step explanation:
If you expand an equation you get its equivalent expression
19/38 is not reduces. Numerator and denominator can be divided by 19.
It can be reduced to 1/2
Answer:
D .
Step-by-step explanation:
that is the answer to the question