From 1986 to 2009, the number B of federally insured banks could be approximated by B(t)=-321t + 13753 where t is the year and t=0 corresponds to 1986. How many federally insured banks were there in 1991? Find the slope of the graph of B. Interpret this slope as a rate of change. Choose the correct answer below.

• The number of banks decreased by 12148 banks per year
• The number of banks increased by 13753 banks per year
• The number of banks increased by 321 banks per year
• The number of banks decreased by 321 banks per year
• The number of banks increased by 12148 banks per year
• The number of banks decreased by 13753 banks per year

Find the y-intercept of the graph of B. The y-intercept is Interpret the y-intercept. Choose the correct answer below.

• The y-intercept is the maximum number of banks allowed in the country
• The y-intercept is the minimum number of banks allowed in the country
• The y-intercept is the number of banks in 1986
• The y-intercept is the number of banks in 1991
• The y-intercept is the number of banks in 2009