Answer
$(a)$ See the image below.
$(b)$ $y = -0.12747x + 261.08901$
$y$ stands for ice extent (million $km^2$) for given $x$ year
$(c)$ $4.1$ million km$^2$
Work Step by Step
$(a)$ See the image above.
$(b)$ We can find the regression line using regression line calculator and then graph it using graphing calculator (also see the image above):
$y = -0.12747x + 261.08901$
$y$ stands for ice extent (million $km^2$) for given $x$ year
$(c)$ If $x=2016$
$y=-0.12747\times2016 + 261.08901\approx4.1$
