from 1987 to 2009 , the number of federally insured banks could be approximated by B(t)= -325.6 + 13733 where t is the year and t=0 correspond to 1987.

A) how many federally insured banks were there in 1992?

B) find the slope of the graph of B.

C) interpret this slope as rate of change

D)find the y-intercept of the graph of B.

the y-intercept is=

E) interpret the y-intercept .

step by step. thank you.