The Price of a Certain Commodity in Dollars Per Unit

question 178

Multiple Choice

The price of a certain commodity in dollars per unit at time t (measured in weeks) is given by ​ .
​
How fast is the price of the commodity changing at ?
​

• A) Increasing at the rate of $13/wk.
• B) Increasing at the rate of $19/wk.
• C) Decreasing at the rate of $19/wk.
• D) Increasing at the rate of $6/wk.
• E) Decreasing at the rate of $13/wk.

---

Definitions:

Circadian Rhythm

The natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours, affecting physical, mental, and behavioral changes.

Two-Track Mind

The concept that the human mind operates on two levels simultaneously, one conscious and the other subconscious.

REM Rebound

The increase in the number and intensity of rapid eye movement (REM) sleep episodes after a period of REM sleep deprivation.

Sleep Debt

The cumulative effect of not getting enough sleep, which can affect health, mood, and cognitive performance.