The national average interest rate for a 30-year fixed rate mortgage is approximated by
y = .015x3 + .112x2 − 1.562x + 8.67 (0 ≤ x ≤ 6),
where x = 0 corresponds to 2000.* According to this model, when was the rate the lowest? What was the lowest rate?
*http://mortgage-x.comm
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