I think it is A and D (at least those are the ones that made the most sence to me).
Answer:
C
Explanation:
Hope this is right!!!!. Have a great day!!!
-Sarah-
Damage to heart valves can lead to heart murmur.
Explanation:
Heart murmur refers to the sound of blood flow. The sound of flowing blood in the heart is usually not heard.
The heart murmurs can result due to two reasons that is either a damaged valve or any condition that causes the heart to beat at a faster rate.
The types of damage to the heart valve that may lead to heart murmurs are:
Mitral valve prolapse, Mitral valve or aortic stenosis and Mitral or aortic sclerosis.
Sometimes, the murmurs do not signify a serious condition but under certain condition they may indicate the risk of heart failure.
we know that difference of 10 dB represents 10 times louder sound, so by applying this,
the difference is 40 db means 10 × 10 × 10 × 10 times louder sound,
hence, the sound outside the library is 10000 times louder than the sound in library.
