Answer:
12. sometimes
13. always
14. always
Step-by-step explanation:
Exponential functions with a positive base are defined for all real numbers. Such functions will always have a positive value.
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12)
The larger the base, the faster the decay for x < 0. In that part of the domain, 2^x > 10^x. (sometimes)
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13)
See the initial comment. (always)
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14)
See the initial comment. (always)
