Fitting quadratic and exponential functions to scatter plots

Determine if a quadratic or exponential model fits a data set better, then use the model to make a prediction.
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Josh has been investing his money for the last 5 years. During this time, he has been documenting his account value. He plotted the points below.
He is looking for a function that models his data. Since the trend of the data is decreasing and convex, he found a decreasing convex exponential model and a decreasing convex quadratic model.
Which of the following functions fits the data better?
Please choose from one of the following options.
Use the function of best fit to predict Josh's account value after he has been investing for 7 years. Round your answer to the nearest cent. dollar sign
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0, point, 75
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4