4
advanced-math

The function h(x)=12(0.6)x+5h(x) = 12(0.6)^x + 5 has a range of:

A

y>5y > 5

B

y<5y < 5

C

y>12y > 12

D

All real numbers

Correct Answer: A

Choice A is the correct answer. Analyze the function's behavior.

  1. Base: 0.6<10.6 < 1 means decay.
  2. As xx \to \infty: (0.6)x0(0.6)^x \to 0, so h(x)0+5=5h(x) \to 0 + 5 = 5 (approaches from above).
  3. As xx \to -\infty: (0.6)x(0.6)^x \to \infty, so h(x)h(x) \to \infty.
  4. Range: y>5y > 5 (never reaches 5, asymptote).

💡 Strategic Tip: The range is bounded by the horizontal asymptote.

Choice B is incorrect because the function stays above the asymptote. Choice C is incorrect because 12 is the coefficient, not a bound. Choice D is incorrect because there's a lower bound at y=5y = 5.