Set 4: Exponential Functions

Choice A is correct. 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.