1. The problem asks to estimate the number of months when the population of guppies and tetras will be the same. 2. From the data, the tetras population at months $n=0,1,2,3,4$ is $8,16,24,32,40$ respectively. 3. We observe the tetras population increases by 8 each month, so the tetras population function is: $$T(n) = 8n + 8$$ 4. The problem does not provide guppies data explicitly, so we assume the guppies population is constant or given by another function. Since only tetras data is given, we cannot find the exact month when populations are equal without guppies data. 5. If guppies population is constant or known, set $G(n) = T(n)$ and solve for $n$. 6. Since no guppies data is given, the best estimate is to use the graph to find the intersection point visually. 7. The tetras population increases linearly by 8 each month starting at 8. 8. Without guppies data, the answer cannot be determined numerically. Final answer: Insufficient data to determine the month when populations are equal.