I need assistance with this assignment

QUESTION 10 The number of research articles in a prominent journal written by researchers during 1983-2003 can be approximated by N' (t) = U(t) = 4.4e0.6t 0.7 + e0.6t thousand articles per year (0 s t s 20), where tis time in years since 1983. (a) Find an (approximate) expression for the total number of articles (in thousands) written since 1983 (t = 0). (Round your coefficients to two decimal places.) N(t) = (b) Roughly how many articles were written from 1983 to 2003? (Round your answer to the nearest whole number.) thousand articles