(r^-7)^6 = r^-42 . . . . exponents are multiplied
The answer would probably be 36
Answer: ABC=36 XYZ=108
Step-by-step explanation:
The substance's half - life is 7 days
<h3>How to determine the half-life</h3>
The formula for finding the half - life is given as;
Half - life = 
The k value given is 0.1027
Half - life = 
Half - life = 6. 75
Half - life = 7 days in the nearest tenth
Thus, the substance's half - life is 7 days
Learn more about half - life here:
brainly.com/question/15575933
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