The Chart Shows the Number of Research Articles in the Prominent

Short Answer

The chart shows the number of research articles in the prominent journal Physics Review that were written by researchers in Europe during 1983 - 2003 ( t=0 represents 1983)
$$\begin{array} { | l | l | l | l | l | l | } \hline \text { Year, } \boldsymbol { t } & 0 & 5 & 10 & 15 & 20 \\\hline \text { Research Articles, } \boldsymbol { A } ( \mathbf { 1 } , \mathbf { 0 0 0 } ) & 1.2 & 2.1 & 3.8 & 5.1 & 5.7 \\\hline\end{array}$$
a. What is the logistic regression model for the data (Round all coefficients to two significant digits.)
$A(t)=\frac{\_\_\_\_}{1+\_\_\_\_ ^. (\_\_\_\_)^{-t}}$
b. At what value does the model predict that the number of research articles will level off

__________ articles
b.c. According to the model, how many Physics Review articles were published by U.S. researchers in 1990 ( t=7)