Several Years Ago, the Wild Rabbits of Australia Were Seriously $r$

Short Answer

Several years ago, the wild rabbits of Australia were seriously threatened by a virus that was accidentally released into their population. Suppose that the following table gives the number $r$ of rabbits (in millions) remaining $t$ months after the release of the virus.

Use a calculator program to find the linear regression line for this data and use this to estimate how many million rabbits were left after 19 months. Round to the nearest whole number.