What is the area of this triangle?

On a piece of paper graph f(x)=5•(0.4)^x

Determine if the outside temperature is a function of the time of day or if the time of day is a function of temperature and explain why or why not.

Jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later, she sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions, how much money did jody make?