After a nucleus undergoes radioactive decay, its new mass number is: always less than its original mass number always more than its original mass number never less than its original mass number never more than its original mass number

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Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

Newtons view of arrangement of the universe