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what kind of function best models each situation? write linear, quadratic, exponential, trigonometric, or piecewise.

1. a radioactive element has a half-life of 20 minutes. a sample contains 66 g of the element. a function models the amount of the sample remaining as a function of time.

2. a function models the nth term in the following sequence: 8.5, 5, 1.5, -2, -5.5, ...

please help and thank you. much appreciated. ​

Respuesta :

sqdancefan

Answer:

  1. exponential
  2. linear

Step-by-step explanation:

1. Any time you see "half-life", "doubling time", "compound interest", "change proportional to quantity", or similar, the model is exponential.

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2. The differences from one term to the next are -3.5. When differences are constant, the function is linear.

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