Question 627543
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
f(x) = .071x2 - .426x + 8.05  ||y = ax^2 + bx + c   &#8658; y = a(x -(-b/2a)^2) - a(-b/2a)^2 + c
 f(x) = .071(x-3)^2 - .071·9 + 8.05 
 f(x) = .071(x-3)^2  + 7.411  Vertex(minimum point) is (3,7.411)
Based on this model when did the percent of people in this income level reach its minimum?  1989 + 3 = 1992