Answer
Estimate: $1750$ million kg of mercury imported in 2230,
Work Step by Step
Using the model found in part (a),
$y=60t+550$ (million kg of mercury)
where t= years after $2210$.
In 2230, t=20.
So, in 2230,
$y=60(20)+550=1750$
Estimate: $1750$ million kg of mercury imported in 2230,