Answer
The life expectancy of an American female born in 1980 is 76.4 years.
Work Step by Step
The year 1980 is 30 years after 1950.
$\\$Thus, $x=1980-1950=30$.
$\\$To find the life expectancy of an American female born in 1980, substitute 30 to $x$ in the given equation to have:
$\\\\y=0.16(30)+71.6
\\y=4.8+71.6
\\y=76.4$