From 1984 to 2010, the number B of federally insured banks could be approximated by B(t) = - 327.6t + 13775 where t is the year and t=0 corresponds to 1984. How many federally insured banks were there in 1989? 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 327.6 banks per year The number of banks increased by 13775 banks per year The number of banks increased by 327.6 banks per year The number of banks increased by 12137 banks per year The number of banks decreased by 13775 banks per year The number of banks decreased by 12137 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 number of banks in 2010 The y-intercept is the number of banks in 1989 The y-intercept is the minimum number of banks allowed in the country The y-intercept is the maximum number of banks allowed in the country O The y-intercept is the number of banks in 1984