Your answer is partially correct.

$($b$)$ Find to $3$ decimal places the average rate of change of newspaper ad revenue and of internet ad revenue between $1997$ and $2016.$ Include units and explain the signs.

Average rate of change of newspaper ad revenue between $1997$ and $2016$:

Average rate of change of internet ad revenue between $1997$ and $2016$:

The units of both average rates of change are

The negative average rate of change tells us that ad revenue for that sectorwas lower in $1997$ than in $2016.$was higher in $1997$ than in $2016.$was lower that the other sector by exactly that amount.increased every year between $1997$ and $2016$ by exactly that amount.decreased every year between $1997$ and $2016$ by exactly that amount. The figure below shows graphs of US advertising revenue $($in billions of dollars$)$ for print newspapers and for the internet $\backslash (\{\}^\{1\}\backslash )$ as a function of years since $1997.$

ears since $1997)$

$\backslash (\{\}^\{1\}\backslash )$ Based on $2017$ research by David Flath using www$.$journalism.org$/$fact$-$sheet$/$newspapers$,$ www$.$iab.net, and fred.stlouisfed.org$/$series$/$GDPDEF$.$