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9966 [12]
4 years ago
7

When a variable is determined by a factor outside of the function or model being​ evaluated, it is said to be A. statistically i

nsignificant. B. exogenous. C. endogenous. D. unexplained.
Chemistry
1 answer:
inna [77]4 years ago
4 0

Answer:

The correct answer is B. exogenous

Explanation:

Let us try to describe exogenous and endogenous variables an exogenous variable value is influenced only by factors outside a model or system and is forced onto the model, while a change in an exogenous variable is known as an exogenous change. Also an endogenous variable is one whose value is influenced only by the system or model under study.

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<h3>Further explanation </h3>

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

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The decay formula for isotope :

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Then for t=20 years, the amount left :

\tt A(t)=217e^{-0.0171\times 20}\\\\A(t)=154.15~mg

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