Question: The number of pieces of NFL clothing, N, sold in the United States (in millions) can be approximated by the function \[N(t)=-0.044{{t}^{2}}+0.163t+4.865\], where t is the amount of years since 1992.

a) In what year were the retail sales of NFL clothing a maximum?

b) Estimate the number of pieces of NFL clothing sold in the year 2003.