<span>During a sleep study electrodes are attached to the scalp, near the chin, near the eyes, on the upper chest, and the lower legs. Sensors are also attached to the upper lip and either the finger or the ear. The electrodes on the scalp measure brain waves or EEG to monitor the different stages of sleep. The electrodes near the eyes record eye movement and the electrodes on the chin record muscle activity to also provide data for determining sleep stages. The upper chest electrodes monitor heart activity. The lower leg electrodes show leg muscle activity during sleep. The upper lip sensor monitors breathing. The sensor on the finger or ear tell the doctor about the oxygen levels in the patients blood. Various other sensors may be used for studying specific areas of concern t the discretion of the sleep lab technician.</span>
I don't understand the question
Answer:
c. Going to the mall if that is what you liked best.
Explanation:
When evaluating the opportunity cost of any move or event we consider the alternate option that was not taken because the other opportunity was chosen ahead of it. Here, the action that was chosen was going to the movies and the opportunity cost of going to the movies would be what they liked or valued the most. Option c states that going to the mall if that is what you liked best and if they liked it best or most then it was most valued or preferred and therefore will be the opportunity cost of going to the movies.
The northern and southern hemisphere
Answer:
Because of its high latitude, there are times in the winter when the sun never comes up, and times in the summer when the sun never goes down.
Explanation:
This is true in Barrow, Alaska, a place that is characterized by having the longest and shortest day.
It has been observed that around May of every year when the sun rises it doesn’t set for about three months. And again, around November in the same year, when the sun sets, the people or inhabitants don’t get to see the sun for about two months.
Hence, the interesting fact about Alaska ha that it has high latitude, whereby there are times in the winter when the sun never comes up, and times in the summer when the sun never goes down.
