Precalculus (6th Edition) Blitzer

$\left.\begin{array}{cccccccc} after\ (years) & 0 & 25,000 & 50,000 & 75,000 & 100,000 & 125,000\\ & & & & & & \\ quantity= & 16g & 8g & 4g & 2g & 1g & 0.5g \end{array}\right.$
The quantity halves every $25,000$ years as follows: $\left[\begin{array}{lllllll} after\ (years) & 0 & 25,000 & 50,000 & 75,000 & 100,000 & 125.000\\ & & & & & & \\ quantity= & 16g & 8g & 4g & 2g & 1g & 0.5g \end{array}\right]$