The bar graph shows discretionary spending by full and part-time college students in some country from 2007 through 2013. The data in the graph can be modeled by 2 S120- the formula D= 1.2x +1.6(x+ 40), where D represents discretionary spending among students, in billions of dollars, x years after 2007. According to the formula, how much money did college students spend in 20072 Does the model underestimate or overestimate the Discretionary Spending Among Students $140- 115 S100- $80- 61 $60- $40 amount of discretionary spending displayed by the bar graph? By how much? O $20 2007 2009 2011 2013 The amount of money college students spent in 2007 according to the formula to the left is $ billion. (Type an integer or a decimal) Does the model underestimate or overestimate the amount of discretionary spending displayed by the bar graph? Select the correct choice below and, if necessary, fill in the answer bax to complete your choice (Type an integer or a decimal) O A. Overestimates by $ bilion bilion O B. Underestimates by $ Discretionary Spending

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