Choice A is the correct answer. Find when height reaches 15 feet.

1. Formula: $H(t) = 10(1.08)^t$, solve for $15 = 10(1.08)^t$.
2. Simplify: $(1.08)^t = 1.5$.
3. Test:
   • $t=5$: $(1.08)^5 \approx 1.469$ (below 1.5)
   • $t=6$: $(1.08)^6 \approx 1.587$ (above 1.5)
4. Answer: Between 5 and 6 years.

💡 Strategic Tip: Test consecutive integer values to bracket the answer.

Choice B is incorrect because growth happens much faster. Choice C is incorrect because$(1.08)^3 \approx 1.26 < 1.5$. Choice D is incorrect because it reaches 15 feet before year 8.