A radioactive radiation with strength 
is suddenly discharged. A man standing at the point 
must run away, in the direction of maximum decrease of radiation.
A) What direction should he choose?
B) The man decided to run along the path 
. Find the directional derivative of 
in the direction of the path at 
.
Definitions:
Market Beta
A measure of the volatility of a security or a portfolio in comparison to the market as a whole.
Explanatory Power
The ability of a statistical model to account for the variability of a given data set, explaining how well the model represents the data observed.
Fama and French
Economist researchers known for their development of a three-factor model to explain stock returns based on market risk, size, and book-to-market value factors.
Firm Size
A measure of a company's size, often determined by its market capitalization, number of employees, or total assets.
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