Choice A is the correct answer. Identify key features.

1. Initial Value: At $x=0$, $y = 10(0.5)^0 = 10$.
2. Base: $0.5 < 1$ means decay (decreasing).
3. Shape: Exponential decay curve starting at $(0, 10)$.

💡 Strategic Tip: Check y-intercept and direction (increasing/decreasing) to match graphs.

Choice B is incorrect because$b < 1$ means decrease, not increase. Choice C is incorrect because the y-intercept is 10, not 0.5. Choice D is incorrect because exponential functions curve, they're not straight lines.