Answer
$W = 5 + 0.64 * x$
Work Step by Step
In 1970, $5\%$ of lawyers were women.
In 2012, $32\%$ of lawyers were women.
The provided yearly increase is $0.64\%$ per year.
To use this information to write a mathematical model, we need to take the starting percentage in 1970 ($5\%$), and add it to the yearly increase ($0.64\%$) multiplied by the numbers of years passed after 1970.
$W = 5 + 0.64 * x$
